Epoxy primer sanding grit Thanks Dan. What grit sand paper should I use on the primer tomorrow before applying the marina blue basecoat? Also should it be wet or dry sand? Wet sanding epoxy removes amine blush, reduces clogging of the sandpaper, and reduces dust and exposure to partially cured epoxy. Is epoxy primer Sandable? Yes, epoxy primer is sandable. If I use epoxy as a sealer on top of the 2K; Should I finish the 2K primer 600 wet before epoxy? And after epoxy sealer, Should I 600 wet sand the epoxy and top coat? This sanding grits on diffrent stages confuses me. In your case I'd scuff it all over with like a 180/240 pad then shoot one more sealer coat of epoxy, flash it off, then 3 coats of primer/surfacer. When sanding, do not break through the epoxy. My question is whether there is a subsequent primer recommended between this aged epoxy and the filler layers and or the base coat. I have used the octoral epoxy primer and didn’t experience any problems sanding that. CM0560563 must be sanded to a smooth surface prior to topcoating. Feb 9, 2012 · For me its generally epoxy primer (I like black), 2 coats of G2, block with 80 till start seeing epoxy, spray 2 more coats of G2, block with 180 till seeing epoxy, then 3 coats of 2k primer, guide coat, block with 400. In this article, we’ll cover how to sand epoxy primer and other important facts about this paint type. Before spraying epoxy over other primer, it was sanded with 180 or coarser. That seems like a very Apr 21, 2024 · I’d sand it as well but assuming the sheet metal is sound and smooth I think 80 grit is too aggressive. Jan 11, 2025 · Sanding epoxy resin is the transformative art of refining surfaces, essential for achieving flawless results in various projects. If you are pretty confident the panels are straight then shoot your 2k primer coats. If you want to learn how to paint your own car, this is the place! Sep 29, 2024 · Sanding down high-build epoxy primer for paint. I am talking about the kind of sandpaper specifically made to block sand primer with. You could apply 2-3 coats of epoxy in place of the 2k primer then sand with 400 or 600. Epoxy for 2K primer: 8 to 14 days Scuff or sand 180-320, 180 preferred. 2K primer for additional coats of 2k: 180, maximum of 24 hours prior to next coat of 2K. You would sand the same way as 2K Urethane Primer—400 to 600 grit wet. If you want to learn how to paint your own car, this is the place! Jun 4, 2012 · I plan on using reduced epoxy 1:1:1 as a sealer. Even if it's not "sandable", you can sand it with whatever grit is appropriate for the job. What grit of paper is adequate to give good adhesion to this? Also what color of scuff pad would I use in tight spots ?I don't want to leave scratches, but I want it to Jul 21, 2024 · Get a smooth base coat finish with the right grit sandpaper. If you want to learn how to paint your own car, this is the place! Jan 27, 2016 · The #1 site on the Internet to discuss and learn about autobody and paint. Sanding procedure as follows: - 180 blocked - 360 / 400 blocked. Aug 16, 2005 · What grit? before epoxy sealer and after? Guys, first of all thanks for answering my questions about this sanding questions. Oct 3, 2023 · Step 11: Priming and Painting Following successful bodywork, proceed with epoxy priming the entire surface. Jan 8, 2013 · if i have a heavily pitted, deep sand scratches or wavy panels i will do the two sanding steps. SPI Epoxy Primer activates with 6700-1 or 6700-4 Jul 1, 2019 · Here is what I have so far: Bare metal sanded with 80 grit 2 coats of epoxy, dry 24 hours Filler where needed after the 24 hours, but within 7 days. After curing, apply a high-build primer, block sand it, and then finish with a urethane primer. Applying a coat of primer surfacer or a 2K primer over the epoxy primer can provide a smoother surface for painting. But if I grind the epoxy, it will just remove it. Jan 11, 2021 · I am using epoxy as my high build primer over poly primer. At this point, I think I have enough epoxy (older than the 7 day recoat window) on In this article, we will discuss the ideal grit sandpaper for priming a car before painting, providing you with valuable insights to achieve professional results. Let's get started! Sanding epoxy primer enhances the surface texture, allowing the final coat of paint to adhere better and reducing the risk of peeling or delamination. What grit will I want to start with and end with before moving on to applying the sealer coat? Jun 20, 2022 · Epoxy primer is one of the most versatile types of paint. See full list on cherishyourcar. Aug 26, 2025 · Primer is the foundation of every professional auto paint job. This process is commonly employed to achieve a smooth and even surface before applying subsequent coats of the coating. I would clean the surface several times with a prep solvent designed for paint work, like PPG's DX330. 7 posts • Page 1 of 1 7 posts • Page 1 of 1 Jump to: May 28, 2025 · Choosing the Right Grit Sandpaper for Primer Before Paint Car When it comes to choosing the right grit sandpaper for primer before paint car, there are several factors to consider. If you want to learn how to paint your own car, this is the place! Jul 30, 2022 · Final Sanding Grits Bare steel for epoxy P80 Epoxy for filler or poly primer: 7-14 days Scuff or sand 180-320. If you want to learn how to paint your own car, this is the place! Apr 11, 2023 · Have 4 layers of SPI epoxy primer down and ready to start blocking. Learn how to sand your epoxy resin projects with our latest beginner's guide. Sep 28, 2023 · If you’re prepping a surface for painting, you’ve probably wondered how to sand before primer effectively. May 9, 2014 · Stage #2 - sanding down the 2K primer before I apply a final thin coat of epoxy primer (sealer coat) prior to spraying the base coat. Wait overnight before 2K. When prepping for epoxy always sand with 80 grit DA paper for bare metal, sand with 180-320 for paint or primer. And yes , a sealer coat of epoxy just before paint as instructed here. You will do your body work over the epoxy coat. Two main techniques, dry and wet sanding, are employed, each offering distinct advantages of resin sanding. 3 coats of filler primer over a coat of epoxy, block sand that dry with 180 or 220 , re prime 2-3+ coats depending on how much sanding i had to do to get it straight and smooth. If you want to learn how to paint your own car, this is the place! Jan 24, 2006 · When I put filler over metal, the rougher the better(ie 36 grit). The Nason tech. The second round of G2 could be optional if the car is straight, just block with 80 and follow with Feb 15, 2007 · What grit should I block sand the bodyfiller, before putting on the 2K high build? Apr 2, 2023 · The car is currently in grey 2k primer and ill be painting it dark blue metallic (gm 9792) i was planning on blocking the car down with 320 wet then spraying 1 coat of black epoxy primer reduced 25%. It smooths rough imperfections, aids in damage repair, and refines resin work. Feb 29, 2012 · The #1 site on the Internet to discuss and learn about autobody and paint. Epoxy primer can also be used as a basecoat for many different types of paints. See this epoxy primer I use can be sanded with 320 grit and painted over. For most car paint jobs, a moderate grit sandpaper (120-150 Jul 9, 2011 · What grit should I use to sand everything down before the primer? I will be using a DA. Metal is best protected from corrosion when you apply body filler over an epoxy primer. Aug 1, 2006 · What grit should I use on the bare metal before I epoxy primer ? I have been told to primer right over the sand blasted spots . Go over it lightly with 80 grit no finer that that for better adhesion, prep sol it and a final wipe with alcohol then use a quality DTM/Epoxy primer follower directly by a couple of heavy coats poly primer. Epoxy primer is a durable, adhesive coating designed to protect surfaces from corrosion and provide a strong base for paint. Think of it like a glue base for primer. wet sand, as mentioned 400-600 depending on paint type. I did some quick reading and it sounds like 80 grit is a popular choice. Jul 3, 2025 · The need for sanding depends on the specific epoxy primer used and the desired level of smoothness. Apr 3, 2024 · “Grit between coats” refers to the level of coarseness or fineness of the sandpaper used when sanding between layers of a coating, such as epoxy. What grit should I use for the final sanding of the primer before I seal and paint? The reason I ask is when I talked to Barry, I asked a ton of questions I believe he said "#320 to #600, wet or dry" but I could be mistaken. Proper sanding is the key to good intercoat adhesion and a smooth appearing surface. If the cured epoxy primer is inadvertently sanded through, a spot repair will be required prior to spraying topcoat. Unless I sand with very, very little pressure, I think I'll sand through the primer (at least in small areas). How to Use SPI Epoxy Primer To use the Epoxy Primer, first, prepare the surface by sanding it. Apr 22, 2011 · The #1 site on the Internet to discuss and learn about autobody and paint. By following the proper sanding techniques and using the correct grit sandpaper, you can achieve outstanding results for your painting project. Aug 24, 2010 · Since you have some sand throughs, I would sand everything with 220 grit or something similar with a DA, then shoot a good solid coat of epoxy over it. Mechanical DA (orbital) sanding or hand sanding of this product works well with 220, 240 or 320 grit sandpaper. As I do not have a paint booth in my shop, I'm curious about using any of the rattle can primers? Any recommendations? Feb 12, 2022 · If so, then you absolutely need to shoot epoxy over it. Just that the sandpaper will load up and sanding will be difficult. Jun 16, 2011 · The #1 site on the Internet to discuss and learn about autobody and paint. Apr 24, 2021 · Sanding grits on bare metal before primer and after Paint & Bodywork Oct 3, 2024 · Its difficult to sand out the scratches left behind from block sanding, so most would apply another lesser building but easier sanding primer like the ones noted above. One of the advantages of epoxy primer is that it can be left as it is before applying a topcoat. Jul 21, 2014 · What brand of epoxy primer are you using? Do you use a hardener or catalyst with the product you are using? Most brands are not meant to be sanded. Sanding shouldn’t be problem but it does need to be fully cured before you attempt to sand it. - 800 wet - 1200 May 31, 2017 · No point in removing too much metal, surface scratches are not removed at that level they are removed by "blocking" the primer. Question#2 are you planning on laying down a 2K or 4K primer over the epoxy? These are both thick primers that fill in sanding scratches with no problems. 2 more coats epoxy. will the 320 grit scratches show through? or do i need to go up to 400 or 600? Sep 17, 2013 · The window of top coating Epoxy Primer is brand dependentfor example SPI's Epoxy can be top coated without sanding for 7 days, others may be as long or less, again brand dependent. 3. Dec 2, 2016 · Should I spray a coat or two of epoxy and then sand that up to 600 grit (its a metallic paint btw) Or should I seal the bare metal with epoxy then spray another round of surfacer, sand that to 400 grit, and spray a reduced epoxy as a sealer a few hours before spraying the basecoat? Or something else entirely? Thanks in advance! May 15, 2014 · When you are applying epoxy primer over already existing finishes, use these same steps above, and make sure to abrade the surface with 320 to 400 grit sandpaper or your Eastwood Contour SCT metal conditioning tool. Sanding primer smooths out texture, removes dust nibs, and ensures the basecoat bonds evenly. An epoxy coating is a protective layer made from epoxy resin that is applied to surfaces to provide exceptional durability and Dec 10, 2007 · The #1 site on the Internet to discuss and learn about autobody and paint. i like to give Feb 17, 2014 · Wet sanding epoxy primer is usually the best way to prep it because epoxy has a tendency to clog paper when sanded dry. Some modern epoxy primers offer improved sandability, while others tend to gum up sandpaper. Learn expert tips and techniques. If you want to learn how to paint your own car, this is the place! Guide coat on the primer and you’ll have no problem with 80 grit scratches on bare metal if your primer has proper build on it. I would use Evercoat G2 polyester 2K primer and sand with 320 dry followed by 320 wet and 400 wet. Wetsand with 600 and go to base. Discover easy tips and get pro-level results on your next project! Jul 24, 2013 · Just finished welding in my floor pan and am about to lay down some epoxy primer on the interior metal. 2–3 coats of regular Jan 4, 2007 · What grit do you guyz use on eposy primer that was laid on bare metal ? How long do you wait for it to dry ? And then what grit do you guyz use on the catalyst primer ? May 1, 2019 · Epoxy over 80 grit. However, the more I read, everyone says to scuff/sand and shoot Epoxy Primer again. If after 7 days, 180, red scuff pad, then 1 coat epoxy. Metal must be clean of all rust, oils, and any films. Try using lighter grits in less noticeable areas until you’re comfortable with the resulting tooth. What final grit is recommended PRIOR to sealer then paint? Aug 19, 2019 · The key to block sanding is to change the sandpaper often and do not press so hard on the block you flex the panel. Regardless of whether you’ve wet or dry sanded it’s always a good idea to go over your work with a gray or red scuff pad. Plan to use reduced SPI epoxy as a sealer per Tech Manual. Good idea to do that even if you still have filler work to do. Learn how to choose the perfect sandpaper for your primer sanding job and get a flawless finish. If you want to learn how to paint your own car, this is the place! Apr 25, 2022 · Some epoxy primers may be applied directly over surface rust and can also be applied wet-on-wet, thereby eliminating the need to sand the epoxy primer prior to your bedliner application. Sep 3, 2010 · The #1 site on the Internet to discuss and learn about autobody and paint. Sep 22, 2021 · SPI epoxy does make a good basic sanding primer, more durable, but slower to build & dry than other products. Dec 28, 2024 · I've read a hundred posts on applying epoxy filler over bare metal, then body filler vs the other way around and I'm going with epoxy first. Aug 10, 2021 · Lots of that information should be available on the data sheet for the epoxy primer. If you want to learn how to paint your own car, this is the place! Mar 5, 2025 · The #1 site on the Internet to discuss and learn about autobody and paint. The basecoat is going to be marina blue. It is not necessary to sand the epoxy before applying the fillers (within the first 7 days of spraying epoxy) as they will bite into the epoxy and feather great. You're going to drive yourself crazy trying to flat that epoxy. Epoxy is a corrosion-fighting, tenacious sealer that sands slowly. Block sand • Allow filler to harden for at least 15 minutes • Sand with 80 grit paper using cross hatch pattern • This gets messy, check out the Contour DSB (Dustless Sanding System) • Wipe down panels and apply guide coat • Sand guide coat to clearly identify lows previously missed Jul 28, 2023 · SPI's tech sheet for their epoxy primer specified "an 80-grit scratch" if applying over any previous remaining coatings. Before spraying epoxy over bare metal, the metal was sanded with 80 grit. With the right grit sequence, you can create a flawless, paint-ready surface. . I sanded everything except the new sheet metal down to bare metal with 80 grit. It is best to use fine grit sandpaper Dec 10, 2021 · I understand the need to scuff with 180 grit then maroon scotchbrite. But I also read somewhere that there can be particals of sand stuck in the metal. I put two more coats of black. A well-sanded surface ensures that the primer and subsequent layers of paint adhere correctly, giving you a flawless, durable finish. Then apply your favorite primer and sand it until it is ready for paint. Aug 10, 2006 · The #1 site on the Internet to discuss and learn about autobody and paint. If i was painting over the epoxy, then i would sand the entire car again for sure and re-apply before base. Jun 22, 2020 · The #1 site on the Internet to discuss and learn about autobody and paint. Epoxy primer can be sanded to achieve a smooth surface for further painting or finishing. Use 80-grit dual-action sandpaper for bare metals and grit in the range of 180-320 for paint or other primer. If you want to learn how to paint your own car, this is the place! Feb 10, 2012 · What I am being told is that because I sanded the 2K urethane primer to P400 (too smooth) before spraying the Epoxy primer, that the epoxy primer will not stick to the 2K urethane primer properly. Sep 27, 2014 · Hey guys, I just applied 2 coats of SPI epoxy primer on my chevelle. At this point you can sand with 400 to 600 wet. Then, clean the surface using our 700-1 Waterborne Wax and Grease Remover. Jun 5, 2025 · What grit do I use to block sand after primer? If you want to prep polyester primer in order to prime over it with another material, start block sanding with 80 to break it open and roughly knock the panel down flat and then do the majority of your blocking with 180 grit and finish with either 180 or 220 grit on a DA sander. Using the correct grit ladder for each one is the difference between glassy panels and telegraphed waves Feb 12, 2009 · What grit to use for epoxy prep, and block highbuild with? 13 posts • Page 1 of 2 • 1 2 13 posts • Page 1 of 2 • 1 2 May 21, 2012 · 100 ways you can do this but because of all the different things you have on the car now, I vote for block the epoxy with 180 to get rid of the 80 grit and seal and paint. Jul 8, 2022 · If perfection is your goal, I would lightly dry sand the epoxy with 320. Apr 24, 2021 · I assumed 600 -800 grit was adequate after primer, before base coat I put the first coat of black but had problems with silicone in a couple places, and could see scratches showing through, so I went back to primer with 600 grit. So, you can sand epoxy with a rough grit and not worry about seeing scratches later. If not careful, you’ll expose the metal substrate again defeating the purpose of the epoxy and you may miss some sanding scratches in later steps. Let the epoxy sit overnight then apply body filler or glazing putty over the epoxy. Jul 15, 2009 · I've just finished my filler work and have a car pretty much covered in 80 grit sanding scratches. If you want to learn how to paint your own car, this is the place! Oct 5, 2011 · It just needs to be scuff to help the 2K primer adhere to the epoxy. sheet for the epoxy primer says nothing about what to sand the surface with except for bare metal 180 grit. More than a week past, sand filler, some block sanding and 180 with the DA since more than a week past. Question is, the filler I have (Duraglass) indicates surface should be sanded with 24 or 36 grit. The type of paint being used, the surface being worked on, and the level of imperfection all play a role in determining the best grit sandpaper to use. If you want to learn how to paint your own car, this is the place! Sanding can be awkward and messy, but it doesn't have to be. From there I use reduced epoxy for sealer. This guide offers insights on how to sand resin effectively for top-notch results. This guide explains how to sand automotive primer step by step using 400, 600, 800, a Apr 19, 2011 · The #1 site on the Internet to discuss and learn about autobody and paint. Efficiency wise you are far better off taking it to 80 grit and then taking the primer down with 320 (dark colours) or 500 (silvers/light greys). It has had epoxy primer on for a couple of years, while working on it. The grit of paper you need to use is dependent on what type of paint your applying, for example, solvent borne Base Coat generally requires a footprint of either 400 dry or 600 wet paper, Acrylic Enamel or Oct 8, 2025 · When considering whether to sand epoxy primer before painting, it’s essential to understand its purpose and properties. Past 14 Days - Scuff or sand 180-320 & recoat with epoxy. So I was just going to hit everything with the sander but I was wondering what is best Mar 22, 2022 · In this blog post, we'll explain how to prepare your car for primer and offer some tips on what grit sandpaper to use, what type of primer to use, and more. I don't want to do more sanding Apr 24, 2012 · 120 scratches on metal is nothing but 120 grit scratches in filler or paint is an entirely different story and would be difficult to fill with an epoxy primer. Then immediately spray with primer surfacer so that I could quit sanding epoxy and move on. Jan 20, 2025 · Learn why sanding primer is essential for a smooth paint finish. Wet sand the primer, apply a sealer and use your chosen base coat or single-stage paint. Apr 14, 2005 · Sanding with 80 grit would be better IMO, offering more of a "tooth" for the epoxy primer to grab. Let the epoxy sit 48 hours before applying polyester primer. Oct 15, 2025 · The #1 site on the Internet to discuss and learn about autobody and paint. Dec 23, 2023 · The #1 site on the Internet to discuss and learn about autobody and paint. Don't know if you need to sand epoxy primer before painting? We'll tell you what the rules of sanding the primer are. Nov 1, 2005 · OK, ready to throw down some urethane primer on the body before I do the finish body work. Jan 25, 2020 · Epoxy resin can be tricky and a little risky to sand, but with the right tips and tricks, you will be able to sand epoxy safely. To improve adhesion, use the filler seven days after applying the epoxy primer. Allow 45-60 minutes to pass before applying the Epoxy Primer. Optionally, you can use a red sanding pad or P120-P180 grit sandpaper for sanding the epoxy. While it typically creates a smooth finish, sanding can be necessary to ensure optimal adhesion of the topcoat, especially if the primer has cured to Because of my slightly rough epoxy coat, the plan was to sand with 600 grit in 5 days and paint on day 6. Sep 14, 2025 · Epoxy primers and 2K high-build primers are both staples in auto body and restoration work, but they don’t sand—or even behave —the same. I use it as a DTM adhesion coat then spray on surfacer to sand flat. So, what grit do I stick on the DA and other than a sand and wash is there Nov 14, 2007 · I am finally getting ready to put some paint on my car. Aug 4, 2010 · The #1 site on the Internet to discuss and learn about autobody and paint. If you want to learn how to paint your own car, this is the place! Aug 5, 2009 · The #1 site on the Internet to discuss and learn about autobody and paint. It’s used to protect wood, metal, and concrete surfaces. What Grit Sandpaper You Should Use on Epoxy Primer Before Base Coat Sandpaper grit is the population of abrasive or tough particles per square inch of a sandpaper sheet. I did the same everywhere on my car, bare metal or not. I assumed that my high build primer coats would cover these, but in reading the tech sheet, I find that it suggests going to 320 before shooting the primer. Right now there is one coat of etch primer (SW 990) on bare metal over 90% of the car (trunk lid is new from goodmark). If you want to learn how to paint your own car, this is the place! Jan 20, 2025 · Is a primer required o be applied over the block sanded epoxy before base coat is applied? If yes what primer should be used if needed? which one is best? If primer isn't required can base coat be applied at any time after block sanding? If bock sanding takes longer than 14 days must another epoxy layer be added before primer or base? Jun 23, 2014 · The #1 site on the Internet to discuss and learn about autobody and paint. SPI is the only one I've heard of that is supposed to be sandable. Klass Kote Epoxy Auto Primer Paint can be dry or wet sanded with fine-grit sandpaper to smooth out any surface blemishes. The main difficulty when sanding resin lies in the hardness of the surface. You could do it but not really needed. com Oct 3, 2023 · Yes, you can sand epoxy primer. I usually sand 2K with a coarse grit initially (120) and if everything looks good, guide coat, block with 180 till 120 scratches are gone, guide coat again, block with 320 till 180 scratches are gone. Dec 25, 2016 · The #1 site on the Internet to discuss and learn about autobody and paint. If you want to learn how to paint your own car, this is the place! In the long process of shooting epoxy primer on a bare metal resto. If you want to learn how to paint your own car, this is the place! Jun 28, 2025 · Wondering which sandpaper grit to use on automotive primer? Discover the perfect grit for sanding primer, plus expert tips to achieve a sleek, professional paint job that lasts. 2K high-build is a polyester-rich surfacer designed to block sand flat and fast. Opinions? Sanding with P80 grit on an orbital sander to establish a consistent scratch profile is a must; this allows the epoxy to key into the metal, giving us the best possible adhesion. I've never done bodywork over epoxy, but it seems the way to go for a street rod. Oct 17, 2019 · Past 7 days you want to sand the epoxy with 180 grit, by hand or machine before applying more epoxy. You can then touch-up spots with a new coat of material if required, and re-sand to desired smoothness. Do I need to sand it all back and Dec 7, 2015 · Then final body work - apply filler within 7 days or sand and apply filler after 7 days - apply high build primer within 7 days with no sanding required? - block sand down to 600 grit for metallic paint Then do you guys recommend sealing it again with the epoxy primer? If so, at what grit do I sand to before sealing? Discover the ideal grit for sanding epoxy between coats to achieve a smooth, flawless finish. When cured you should apply a guide coat (I use 3M Powder) and then block sand with say 180 grit just to remove the guide coat. Epoxy doesn't sand for crap. iuyfp vqdd mcnq gvgyiw chmcdndf iuc pmr fwdn zxa xegy geiuub tszzleo lgr wkwa ytyr