To fix this piece of the paint is still coming off, I really think you need to take it back down to the base, and the easiest way would be to sand it all off. i have a 73 camaro thats been restored with all new metal and is being prepped for paint now. I am wondering if there is anything like that for wood too?. Rub out with 0000 steel wool and paste wax. Always sand the whole area, 1-2" past the filler, never sand one area for any length of time, as this will cause a low spot. Metal Primer – Many universal metal primers offer quick drying, 1 hour to topcoat, and good adhesion to iron and steel. If you are going to use a high build primer sand with 180 grit then prime and then sand the primer. Best Answer: Yes, you will be required to sand the primer coat before applying the base coat. There is no point (and probably some harm) in buffing before the very final coat. Should I have used a primer after etch-priming before my top coat cellulose? the etch-primer said it should be a suitable base on its own prior to a top coat. Make sure the brick is clean before priming. If the sanding was properly done at the outset, there would be no need for more. Wet-sand the base coat before starting the clear coat. While KILZ ADHESION Primer is formulated to bond without sanding, it is recommended that a small area be tested for adhesion prior to beginning the job. If you are only going to put sealer on sand the car down with 320 grit then seal it then paint. All three products are totally compatible with each other so you won't get any crinkled surprises. As for clear coat. Whether you're talking about paint, primer, bare metal or anything in between, your car's body can be smoothed by wet sanding. As far as sanding goes, don't do it to big flakes, the edges catch and mess the surface. If you routinely apply sanding sealer before finishing, you may be taking an extra, unnecessary step. before you do anything give the wood a nice rub down. Clear Coat Wet-sand the base coat before starting the clear coat. Does It Really Matter? The answer in short to that is yes. Usually, two coats of primer are sufficient. If you repaired paint damage, you must apply a spray primer paint to create a surface to which the base coat can adhere. Since Zinsser told you its ok to use, all you need is a finish paint comparable to the primer so that would basically allow you to choose any decent paint. If you're painting the whole car, a nice even coat of primer will give you a solid base to spray over, which will result in even coverage with less paint. sanding will mess with the flop of the metallic. If the surface is rough apply one coat of Pettit’s 6627 Tie-Coat Primer. This automotive video will show you how to block-sand the primer to prepare you for the actual paint job. There are just more options to epoxy primer then DPLF. How long do you let the primer dry? Car Modeling Car Forums be 5 days to allow the primer to gas and harden before any top coats go on. Before primer, I like to use a medium grit sanding sponge (if I am not. Wipe it down really good with a clean rag and give it a couple of hours to dry and give it a very thin coat of primer. If the baseboards are not painted and will only be re-stained, sand them twice: first with a 120-grit, then with a 180-grit. Unless there is a flaw that needs to be addressed, and then, I will normally only sand in that area. Use only undercoats recommended for the particular substrate and top coat finish being used. If the primer dries out too thoroughly, it won't bond well to the top coat. One hour after the last coat is sprayed; the primer should be dry. With the ChromaBase, they recommend letting it flash 15 to 30 minutes before clearing and list 24 hours as the maximum allowable dry time before clearing. 2-pack primer fillers have a much higher solids content, which together with their particular type of resin base gives much better filling power plus less problems with sinkage than air dry products. This video will show you how to do just that. Applied OIL-based primer - rolled on with a 4" foam roller (2 coats). So if your color coat looks good dont touch it apply your clear and sand and buff the clear. Remove gloss from previously painted surfaces with gloss remover or by sanding. If you're painting your auto yourself, you might need a little help if you've never done it before, especially when it comes to the primer sealer and apply your first base coat of paint. TIP: It’s important to sand between coats to ensure a smooth final finish. Wet sanding, progress from 600 then 1000 then 1500 then 2000, but be careful, it only takes a few passes to cut the texture off the paint. Find the information you need for a specific product or category, so you can make the right product choice for your project. The is a foam roller you can use to paint the door that will not leave any marks. be sure to. Definitions are in order here. Apply your top coat and wipe it off with a rag exposing the base coat as little or as much as you wish. A coat of primer is recommended for almost all painting projects, whether it's new drywall, old wood, bare metal, previously painted brick, or any other surface. Sand again. With the wet coat system we used an epoxy primer under polyester paint. This coat contains the visual properties of color and effects, and is usually the one referred to as the paint. If you have any dust, bugs, or runs in the base, you will want to spot sand those before applying the final coat of base. I have the 67 in primer (laid down a seal coat in reduced SPI epoxy after final blocking of the car last fall). Developed for professional and commercial applications, this advanced technology water-base combines dependable stain blocking power with fast-dry. No sanding or etching or deglossing agents are needed to get a firm bond. Sand Your Primer. Surrender to the fact that two medium primer coats are better than one heavy primer coat. 400-600 if sealing before basecoat. When you spray paint your car yourself, you first apply a primer, then a base coat, and then a clear coat, but it can be difficult to get these coats to look even because the paint has a. What methods are you guys using for wet sanding? Sponge type pad and 400 to 600?. If you're painting your auto yourself, you might need a little help if you've never done it before, especially when it comes to the primer sealer and apply your first base coat of paint. I used this as a final coat to a repair using the Perfect Match primer and color coat as a base. If you've only used it in areas, the best way might be to remove it (sanding) before applying the high build primer or whatever you lay down next. For this layer, a heavy coat of primer should be applied to the entire body. Painting aluminum, for the do-it-yourself boat owner, is often a matter of maintaining a pre-existing finish. Today I shot 3 coats of SPI Dark Red base and now it will sit overnight before clearing. This was to seal the self etching primer and also for sanding down for the finish coats, which were usually basecoat and clear. How to Prepare a Car for Paintwork Dry Sanding. I usually apply two primer coats and between coats is when I look for things I did not see before and fix them before. If you want to prime in the normal way seal with polyurethane as above, then apply a few coats of acrylic 'gesso' primer (three or four thinned coats) then wet-sand if you want a smooth surface and. The kind of primer you end up using will vary with your project needs. Let dry 4-6 hours. Your car must be lazer straight if all you needed was a couple coats of epoxy. If you want the best epoxy primer, we think the Custom Shop Epoxy Primer is a very good deal. SPI dries slowly. If its dry or got heaps of **** in it you are going to have to let it dry out before rubbing the imperfections out. If you have any dust, bugs, or runs in the base, you will want to spot sand those before applying the final coat of base. Each time he sanded, Townsend shifted the direction of his passes with the sand paper, but. If you wet-sand the base coat, wash the vehicle with soap and water after this step, not before. Allow the surface to dry completely. 7/6/2016 Primus® DM Dry mix, polymer-modified, cementitious adhesive and base coat. Any area that has had bodywork, or where bare metal is exposed, must be primed before painting, but paint will adhere just as well to sanded paint. I have used shellac as a primer on knotty woods like pine. Re: Best Primer for Poplar Hi Does anyone make a latex or oil sanding / sealing primer similar to what I used to use for painting cars by Dupont. It's actually a pretty simple step in auto painting. Aluminum oxide The jack-of-all-trades abrasive; great for hand or power sanding on wood, paint, or metal. Epoxy Primer. Can you paint over POR-15? sand it down, and then use a good etch primer from a rattle can if the area is small. For truly professional results, you need to lightly sand the primer before you apply the first coat of finish paint. I don't know why they have that requirement (perhaps streaking somehow?). Look for a high-quality bonding primer to paint over the piece as a base coat—they're designed specifically to get paints to adhere to a range of surfaces. first base coat very light, second coat full coverage let flash (15 mins or so?). Or if doing a stain or trans finish I still use the sealer over the stain, then the clear coats at around 9-12 coats. The primer coat should be perfect before you apply color and you shouldn't have to sand the color coat. I would suggest a dark gray almost black. I don’t waste my time with shellac since any resin based top coat will serve as its own primer/base coat. This is why you would want to use a 2K primer over it, so that you can sand the 2K smooth before painting. It is often a step in polishing cars and other items. Lacquer is very forgiving. I would recommend at least 6 clear coats before sanding and polishing. Let the primer dry for about an hour. When using Acrylic Lacquer Primer Surfacer the surface can be left without a top coat for approximately 3 days after sanding but prior to top coat application however because so much dirt and oil could find its way to the surface it is important to seal the surface prior to applying your base coat. Abrasive grade to be used is now P400 / P500 to remove the structure of the previous primer application and leave the perfect surface for the base coat to be applied to. If you are painting the second coat as soon as the first coat is dry then you don't need to bother. Let it dry overnight and sand again. For most interior woodwork two or three coats of shellac give a beautiful, velvety sheen that is unmatched by any other finish. The stain will be locked in the primer film and will not bleed into the topcoat. Unless the surface is unfinished or you’re switching between types of paint—such as oil based woodwork being covered by latex paint—you don’t have to prime before painting again. do i need to prime Priming is a term most people know, but when painting internal walls it is generally referred to as sealing the walls rather than priming. A badly treated area will show up with a darker coloured base coat and ultimately lead to contact corrosion. It's actually a pretty simple step in auto painting. Tip: Key is not to sand through the primer and open up bare metal again. wet or dry sand primer - always in finer and finer gradations - i think you can go upto 600 or even 800 grit before you'll start having adhesion problems (i'm going to 400 grit dry for my daily driver bus) - if you went up to say 1200 grit on the primer, you basically wasted your time and you will need to get a little more scuff on the primer - with a lower grit (600 would work). I would sand the surface after filler. Under Non-porous Wallcoverings. I really thought it was smooth enough, but this primer/paint is making it look rough. The odor of some primers can be really strong. Whether you're priming a porous substance such as wood or a smooth substance such as metal, you need to sand the substance beforehand. Wet sanding, progress from 600 then 1000 then 1500 then 2000, but be careful, it only takes a few passes to cut the texture off the paint. Make sure the paint is dry to the touch before turning pieces and painting the other side. NTS provides a lasting, durable color finish that can be applied over LaHabra FastWall Fiber-47 Scratch and Brown, LaHabra Fastwall Stucco Base, portland cement plaster "brown coat" and Parex USA Stucco Level Coat by hand or machine application. At the very least I would suggest a couple of thinned coats of polyurethane varnish as a sealer, then lightly sand with fine paper before painting. For truly professional results, you need to lightly sand the primer before you apply the first coat of finish paint. Scuff and wipe clean before applying the second coat of paint using sandpaper on imperfections. The tinting helps to provide better coverage. Spent the last half a year getting it all put back together. (Use Guide Coat) 400 to 600 Grit Final Sand To Prepare Primer or Painted Surface For Paint - Full Panel Paint (DA Sander or Dry or Wet/Dry Sanding) 600 to 1000 Grit Prep Panel For Clear Coat Only - Blending (I Do Not Recommend 600 Grit, But It Has Been Used) DA Sander or Dry or Wet/Dry Sanding) Sanding Primer Surfacer and Final Sanding. What is a re-coat window? Re-coat windows apply to enamel paints and refers to the time period during which a second coat maybe applied. Dried Film Build Per Coat: 2 ‐ 3 mils Drying Times Between Coats: 5 minutes at 70°F (21°C)* * Be sure the prior coat has completely ﬂashed before applying addional coats. Step four is actually a step that you should do throughout the entire process. The first coat of urethane clear is applied over the top of the color. • Overcoat Fiberglass No Sand Primer with single part paints only. Sand, prime, undercoat and topcoat in the same way as you would Pine, making sure to sand gently in between every coat for a super-smooth finish. Had to lightly scuff with sandpaper before painting the last coat. Im painting a bicycle, with car paint, since the urethane has to be bought just before you use it, i decided to paint my frame with base coat and do the clear some other day when i had time a good friend told me, this was wrong. Immediately apply one coat of Pettit’s 6980 Rustlok Primer. If you have trouble sanding the primer, but you really want it to be smooth, it may actually be less work to skim coat it with drywall mud (I like USG all-purpose), then sand it smooth until you're happy with the surface, and just paint over that. There are a few spots that I need to wet-sand down to smooth them out. Make sure the paint is dry to the touch before turning pieces and painting the other side. If you use 220 your going to need some heavy primer to cover up the sandpaper markes of youll see them in your base. When you hit a high spot you'll go through to the metal in nothing flat and you have to stop and look things over. Gelcoat was coming off in large sections leaving sharp unsafe areas for walking. However I applied two coats of primer (Rust-Oleum) and the two coats of paint (Rust-Oleum High Performance Enamel) then forgot to sand between each coat. Step Ten // Pro Secrets for Painting Kitchen Cabinets. UC- 35 is a fast drying, high-build clear coat. i am painting my motorcycle helmet with automotive sandable primer and automotive paint. Self-etching primer is a primer that can come in an array of mixtures including a compound mixture that you have to mix yourself. You want to make sure 100% that you are done doing body work. I have started the primer process after cleaning the cabinets thoroughly. i have a 73 camaro thats been restored with all new metal and is being prepped for paint now. From my knowledge sanding lightly is ok after priming new drywall, but manufacturers suggest only sanding a light first coat. Sand Thoroughly In-Between Coats. as prep is it's entirely own thing. The powder coating applicators indicate that no primer other than conversion coatings is required for good adhesion to the substrate. If your wood is rough, prime it again, re-sand, feel, then apply the last paint coat. Let the primer dry according to instructions. Do not use near open DRY & RECOAT. My plan now is to wet sand the epoxy and spray a fresh seal coat then go to base and clear. Mist the scratch coat periodically to ensure strong curing. The first coat of urethane clear is applied over the top of the color. keep it uniform and quickly go over a large area, then come back and go over it again. Surrender to the fact that two medium primer coats are better than one heavy primer coat. So if the penultimate coat is good you might be OK without sanding, but sanding does provide something for the final coat to bind to if the previous coat was applied some time ago, so ultimately it will provide a more durable finish. It actually begins the day before you repair paint chips and scratches. When using Acrylic Lacquer Primer Surfacer the surface can be left without a top coat for approximately 3 days after sanding but prior to top coat application however because so much dirt and oil could find its way to the surface it is important to seal the surface prior to applying your base coat. Extremely hard; sharp enough to cut glass, but wears quickly. Skim coat plaster with durabond 90 The walls are plaster and there are some cracks some hairline and some an inch wide with a few places that open up to about the size of a mouse pad. Spray the primer evenly in broad back-and-forth strokes and allow to thoroughly dry (up to 24 hours) before moving on in the process. Next , clean gun and mix base coat paint as per directions and shoot. Sanding your car surface with 150 - 220-grit paper sets the surface as a primer or a guide coat. If you have any dust, bugs, or runs in the base, you will want to spot sand those before applying the final coat of base. Surface Preparation: Surface must be clean and dry (free from all dirt, oil, wax and polish) before using the Aqua Coat Clear Wood Grain Filler. All of us have attempted our own paintjob with differing results from good to not-so good. Truth is, any film-forming finish works as a "sealer" because it closes off the pores of the wood and lays a base for the topcoats. If you should decide to sand give it a light. A spot test is recommended before proceeding. how would you guys (pro's) do it in a shed environment? like primer, sand flat etc. Sand again. When dry (again at least an hour) sand the coats flat. Next, use a power sander to smooth out the surfaces. If you have orange peel in your color coat you can not simply sand and clear because the metallics in the paint whether a base coat or single stage will change their depth and you will probably end up with a light area that. Wipe the dried epoxy primer with a lint-free cloth and apply two to three heavier coats of lacquer filler primer allowing drying time between each coat. Back to top of page. Obviously, most of it going to be covered in black. The base coat is a lot thinner than the clear coat, so if you happen to get through the clear without realising, then you will burn through the base coat in no time. Allow the primer to dry before adding the base coat. Final Preparation Before Spraying All primer and filler coats must be thoroughly hard dry before any sanding and final preparation is carried out. We like Behr paint primer in one over raw MDF. It's actually a pretty simple step in auto painting. I have found that. And while it is true that residential and light-commercial painters. The Best Drywall Primers in 2019 Last updated: June 19, 2019 Reviews , Tools & Garden When it comes to picking out a primer before painting their drywall, many people find themselves at a loss as to what they’re looking for. If you are painting the second coat as soon as the first coat is dry then you don't need to bother. Sanding a car for paint may sound pretty easy, but there is a fine art to making sure your paint is nice and level, and that you don’t have any dips or spots. I'd wait at least 30 minutes, if not an hour before wet sanding any spray paint colors. Nitrocellulose Lacquer is the best finish. if your using satinwood just put 2 coats of that without the undercoat. My dad spent his time focusing on the doors once he got home from a long days work. One would think it would not, for the sand marks are below the clear, but it does. I want to avoid any sanding marks coming through the paint. The basic principle is just to keep every coat as level as possible without sanding through, and only aggressively sand and buff the final coat. If you're painting the whole car, a nice even coat of primer will give you a solid base to spray over, which will result in even coverage with less paint. rubbing down basecoat before clear coat? My Profile My Preferences My Mates. Smart Prime is a revolution in water-base technology after years of research to develop oil-base characteristics in an all-purpose, all-surface water-base interior/exterior primer. Also suitable as a mid-coat for metal, before application of a Sikkens Rubbol top coat. It’s an acronym for Sealing, Unifying and Bonding. SDSCN 11306. 600 if going straight to base. This is why you would want to use a 2K primer over it, so that you can sand the 2K smooth before painting. The body’s three coats of primer had been block sanded with 320-grit paper using a board file. This is my nitrocellulose lacquer finishing schedule. From what I'm finding it is for panels that need a lot of straightening or are wavy and mine isn't. Air Dry to Sand:. This will give the paint a texture to grip on to. Sanding A Car For Paint. My plan now is to wet sand the epoxy and spray a fresh seal coat then go to base and clear. So, if sanding is not your thing, give it a try, it should work! This primer blocks all those pesky stains that love to creep through paint – tannin bleed, water stains, smoke stains. How good did you do on the bodywork? Small imperfections can be filled with primer by spot-painting them and lightly-sanding until the primer fills the low spot. Base coat/clear coat finishes are what car manufacturers use when building new vehicles. If this is not possible, sand with emery cloth and wipe down with TotalBoat Dewaxer & Surface Prep before priming. Use some 400 grit and wet sand it gently. Prep, Prime and Paint your ride like a Pro! After you've sprayed your primer you might wonder what exactly to do next. For a car, the paint job has many layers. Obviously, most of it going to be covered in black. What is the difference between primer and sealer in the automotive paint industry? This is a great question and could lead into a forever explanation but I will make it as short as I can. Applying the Brown Coat The brown coat is the second coat of stucco. The guide coat will provide a visual reference to the sanding progress, since it will be. Additionally, we like it how it is very easy to sand, which is always a plus. Remove gloss from previously painted surfaces with gloss remover or by sanding. That is using sandpaper with 320 - 360 grits to finish the surface. Wipe it down really good with a clean rag and give it a couple of hours to dry and give it a very thin coat of primer. Wet sanding is an amazing process that, when done properly, can result in a surface that's as smooth as glass. The reason they suggest not using an acrylic primer with oil based paint is because the oil based paint takes longer to dry than acrylic which could cause cracking of top coat, but if acrylic is dry properly it will be fine, I've never had a problem. You can also use a rag moistened with mineral spirits (for an oil-based poly) or cheesecloth moistened with denatured alcohol (for a water-based poly). I sand the sandable primer coat with 600 grit 3M flexible sanding pads the day of painting then spray a urethane sealer coat after solvent washing the sanded primer. Our epoxy is used for both your seal coat and your ﬂood coat. I would think that the base coat would show imperfections unless you wet sand it before you hit it with the clear. Primer coat should be sanded with 220 grit paper and tacked clean before receiving two thin, even coats of HOLLANDLAC Brilliant 98. Try to recoat the primer with a finish coat of paint within 12 hours if at all possible. Then lightly wet sand the primer with 400 grit followed by 600 grit. [paint] If a second coat is required, allow 16 hours to dry before sanding and applying second coat. Whether you're going from one color to another, bare wood to painted, or just applying a fresh new coat of white paint, here are some tips and tricks to help you get great results!. Surrender to the fact that two medium primer coats are better than one heavy primer coat. Re: Best Primer for Poplar Hi Does anyone make a latex or oil sanding / sealing primer similar to what I used to use for painting cars by Dupont. "Wet sanding" refers to sanding with your specially designed sandpaper wrapped around a skinny sponge with water running on your sanding area to clean away paint/primer from the area you are sanding. I used this as a final coat to a repair using the Perfect Match primer and color coat as a base. After priming, they typically sand the primer layer before painting the wood in order rough up the surface even more so that the new coat has something to really grip onto. For this layer, a heavy coat of primer should be applied to the entire body. #6- Not Using Primer Correctly. This means that your vehicle is prepped, a coat of primer sealer applied, and then two coats of basecoat. Popular Mechanics offers some assurance for those who find ghastly scratches on their cars: Many of these scratches can be repaired with some buffing and sanding. To Prime or Not to Prime That is the Question it from absorbing excess moisture during rain before paving. Sand the surface now using Festool Automotive Systems LEX3 150 / 3 or Festool Automotive Systems EETS / EC 150 / 3, equipped with a soft back-up pad. Applying the Brown Coat The brown coat is the second coat of stucco. Think it was an etching primer. Then scuff the epoxy primer before applying the primer surfacer. rubber or foam blocks. It will go on just the same as the others. Make sure the bumper is COMPLETELY dry before applying the next coat of primer. Submerge fine grit (around 3000-grit. Base coat used in automotive applications is commonly divided into three categories: solid, metallic, and pearlescent pigments. If you’re planning a multi-tone design, this is the base coat. If you already have three or more coats of oil-based paint on the house, use oil-based house paint. The primer aided us in getting the proper dry film thickness. 3 drys and 2 wets each round of sanding preceded by priming. sanding will mess with the flop of the metallic. New plaster or masonry surfaces must be allowed to cure before applying base coat. wet or dry sand primer - always in finer and finer gradations - i think you can go upto 600 or even 800 grit before you'll start having adhesion problems (i'm going to 400 grit dry for my daily driver bus) - if you went up to say 1200 grit on the primer, you basically wasted your time and you will need to get a little more scuff on the primer - with a lower grit (600 would work). Allow to dry 3 hours before lightly sanding. The body's three coats of primer had been block sanded with 320-grit paper using a board file. If you spray a clear coat before the base is fully cured and hardened it will ruin it. Allow the primer to dry before adding the base coat. This is basically what I did: 1. Sand the table with a fine grit sandpaper after applying the first coat of paint. Typically, you should apply two or more coats of primer to ensure the bare metal is completely covered. Remove all dust with a vacuum, forced air or damp cloth (water). Paint the walls with the base coat … Prepare the cabinet for sanding … coat of metal primer. We suggest priming with Loxon Exterior Masonry Primer or Loxon Masonry Conditioner. SDSCN 10201D. Now, let’s talk about Wet Sand & Dry Sanding Techniques When Prepping for Base Coat Painting. Let the lacquer primer dry until it’s dry to the touch-at least one hour-before sanding. Nitrocellulose Lacquer is the best finish. Shellac is used when you are covering a stained wood with paint. It helps to kill those smells. Primer be sanded with 320 or 400grit for multiple applications of primer (check your tech sheet with your primer from the paint store - theyre all available online for free from the websites too). I noticed the finish was shinier where the knots were primed. The powder coating applicators indicate that no primer other than conversion coatings is required for good adhesion to the substrate. 400 grit Used for rough sanding primer. At this point all surface defects that passed before can be corrected with your favourite putty used before this base coat. Primer effect will be improved if the surfaces are smoothened by a sand paper, and dust removed with a damp cloth, before the application of primer. I too thought about wet sanding the car before applying my 2k high build primer, gotta find a way to stop clogging the paper. Mold or Mildew Covered Surfaces: Wash the area with a mildew remover, rinse with water and allow to dry before priming. never ever fixate on one spot. Wipe it down really good with a clean rag and give it a couple of hours to dry and give it a very thin coat of primer. Usually, two coats of primer are sufficient. A coat of primer is recommended for almost all painting projects, whether it's new drywall, old wood, bare metal, previously painted brick, or any other surface. Using the same application method as before, completely cover the base coat surface with a coat of the clear varnish. No sanding or etching or deglossing agents are needed to get a firm bond. How to Paint the Walls Next to Moldings. If you use 220 your going to need some heavy primer to cover up the sandpaper markes of youll see them in your base. The # 1557 is a Non Sanding Ready to Spray Red Oxide Enamel Base Primer/Sealer. re-primer, and sand. I would recommend not letting a high build primer/surfacer sit on the car for a long period of time before applying the sealer if its been layed down over bare metal. Let the primer dry according to instructions. sanding will mess with the flop of the metallic. What color is on the wall, how much the wall soaks up the first coat of primer, as well as the primer you are choosing. Wet sanding makes the surfaces smoother. Scrape and sand the surface of the knot to remove excess sap and wipe with a rag soaked in mineral spirits. If any color is still showing through, then by all means give it that second coat, it will save you money on paint. Before painting your vehicle, you'll want to sand down the primer coat. SDSCN 10201. After curing, apply a dry guide coat before block sanding (3M05861) Block sand with 400 grit and reapply guide coat. Gelcoat was coming off in large sections leaving sharp unsafe areas for walking. Remove the primer dust with a quick brush from the shop vacuum, followed by a light swipe of the tack cloth. How to Prime Your Car Before Painting. ) If you have any cut throughs, you will need to apply a coat of sealer. Apply 3 coats of the poly finished---Sanding with 320 grit between coats. Thank you for watching this video about the correct sandpaper grit you should sand your car with before paint. clean water. So if the penultimate coat is good you might be OK without sanding, but sanding does provide something for the final coat to bind to if the previous coat was applied some time ago, so ultimately it will provide a more durable finish. I've submitted these to the Craft section of the website, but as it may be a little while before Reaper has the time available to add them, Bryan suggested that I post them here. Spraying the basecoat: Next to rushing the 2K primer, rushing the basecoat is the second cause for the final gloss and depth of a paint job to look bad. Had to lightly scuff with sandpaper before painting the last coat. Hope that helps!. Sand all surfaces to smooth them out and use a wire brush or paint scraper to remove loose paint. [paint] If a second coat is required, allow 16 hours to dry before sanding and applying second coat. MEKP activator included. This sounds as if you may have burnt straight through the base coat and the grey spots are the primer underneath. What methods are you guys using for wet sanding? Sponge type pad and 400 to 600?. Also a couple of the corners had crumbled and are now dug out with trenches about an inch wide. That is; apply two more coats. Primer dries super fast and it’s really the most important step in making your jars look good and less streaky. I too thought about wet sanding the car before applying my 2k high build primer, gotta find a way to stop clogging the paper. If you spray a clear coat before the base is fully cured and hardened it will ruin it. Once primer is dry, you should sand the primer before moving on to the basecoat color.