If this was a two-stage paint, you would only be sanding the clear coat and the water will only turn milky. Then, soak 2000-grit sandpaper in water for an hour before sanding around the damage to blend the repair area with the clear coat. Use an 800 grit sandpaper to sand the clear coat down and leave a surface area that is roughened up. DRM Motors is one such service centre that can assist you in getting the painting done. Here I'll show you how to sand down the sags to a smooth surface and then repaint. I used 3M 600 grit wet sanding paper to make small circles and knock the bumps down. It’s important to start over with a base coat for the new urethane to bond properly. Rub the buffed area with a clean rag to remove any residual compound. When I wet sand, I like to add a few drops of soap to the water in order to allow the sandpaper to glide more easily over the surface and not grab as easy, biting into the paint. Wet sanding will turn your new enamel paint job from a spotty, uneven mess into a glazed finish that will make your car gleam. Although it can be time consuming, color sanding will give your car a mirror-like finish. The clear says it should flash for 25 minutes. You should go about an inch past the clear coat damage. Remove the sandpaper from the water and wrap it around a sanding block. Be sure your surface is clean and dry (remove all contaminants), Use only when temperatures range between 50F and 90F where relative humidity is below 85%, Begin and finish spraying off the object using a side-to-side sweeping motion, overlapping your spray slightly with each pass. The result (especially with a clear coat) is a dull and speckled surface rather than a smooth glass finish. Then, reshoot those areas with primer. You can sand for adhesion and spray a new coat of clear over the base, but it will never lock in, and it will always sit on top of the old clear at the edges. Their service centre provides end to end services in terms of painting, polishing, repairing modifying, and maintaining the vehicle. I just had a thread on that a few days ago. The goal is to try and not go beyond the primer layer. Wet-sand the base coat before starting the clear coat. Their experts do a fine job and thus have many satisfied customers. I would not recommend dry sanding. This is to replace the orange peel with finer and finer scratches, which will eventually be filled in with polish. Therefore, new paint layers hang on subsequent wet layers and gravity does the rest to pull the paint down the vertical surface. To fix a peeling clear coat on your car, start by scrubbing the peeling area with 1000-grit sandpaper to get rid of the damaged coat. In this video I am going to not only show you how to repair peeling, chipped or worn out clear coat. Chris Deziel has a bachelor's degree in physics and a master's degree in humanities. Step 4: Continue wet-sanding with higher grit sandpaper. Now, let’s talk about Wet Sand & Dry Sanding Techniques When Prepping for Base Coat Painting. While it is soaking, … As you work away from the damage make your sanding … The polishing helps smooth out the scratches made by the sandpaper. Besides having an abiding interest in popular science, Deziel has been active in the building and home design trades since 1975. If you find the coarse attachment cutting too hard, switch to a lower grade, but make sure the entire surface has been cut to the same level. Did you make this project? http://CollisionBlast.com - What grit of sandpaper to use when block sanding primer surfacer and final sanding a car to prep for a paint job. If you find damage, use 400-600 grit sandpaper and an orbital sander to wet-sand off all of the old clear-coat. Keep the surface moist while you're sanding by frequently spraying it with water. The skills and supplies needed to wet sand your enamel paint job are few, so don't be intimidated. Color sanding is just a term used, it's sanding the clear coat flat with 1000grit and finer paper, then buffing it out with compound. Drying time. If you decide to repaint the wood surface, you can smooth it out using a medium grade sandpaper such as 120-grit. Avoid overheating the surface when you are buffing it or you may damage the base coat. 3 years ago. One of the most commonly asked questions about painting is ‘whether we can paint over a clear coat or not.’ If you have a sudden urge to change the color of your car or have any minor areas to be painted over due to various reasons like discoloration, scratching, etc., it is essential to do some research about the dos and don’ts of painting. Remove scratches left by the sandpaper by following up with 1500-grit sandpaper and then 2000-grit sandpaper, wetting the paper and the surface in the same way as you did before. How long do you have to wait for the spray paint to cure enough to start wet sanding? It will probably adhere well enough to have a single layer. You can perform wet sanding once or refine the enamel with successive sanding. Add Tip Ask Question Comment Download. Also, be sure to add a pump or two of liquid soap in your water bottle to help glide over the surface. Colors take a little longer. This step is pretty standard since you'll simply follow the same steps you did the first time you painted, which can be found on the back of the can you're using. When you apply spray paint too fast, too heavy, too cold of a climate or too humid of an atmosphere, you can get sags in your paint. An interesting article giving a detailed account on how to fix and polish spray paint. Sanding and polishing clear coat overspray. You may be wondering if sanding a clear coat is something that you can handle; then, the absolute answer is yes. So, I've been working on the final stages of the center channel stand I'm making for my Definitive Technology CS-8080HD center channel unit and I paid the price by rushing. If you are getting color in a two-stage paint, that means you sanding through the clear coat and have damaged the finish. © Copyright 2020 Hearst Communications, Inc. My garage was very cold when I was painting the metal, which caused a couple of problems with the Rustoleum spray paint I was using. Make sure that when you’re applying your coats of clear coat that you do apply the coat as thin as you possibly can, applying the second layer after the first layer has dried, and so on. You need to wet sand clear coats with very fine sandpaper. Sanding is the process that keeps the topcoat smooth and removes the "orange peel" look. The clear coat creates a strong chemical bond with the still slightly “wet” paint and locks in. Reply Wet sanding makes the surfaces smoother. It is that good of a product. 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