3/28/2024 0 Comments Sandpaper grit chart automotive![]() Most manufacturers list the type of material best suited for sanding on their product labels, but it’s smart to know what type of grit material to look for before you shop. On many projects, you’ll start with a coarse sandpaper grit, then gradually switch to finer grits to obtain a smooth finish. Extra fine sandpaper (150 grit or higher): Often used between coats of paint or varnish, as well as for finishing.Fine sandpaper (100 to 120): For most DIY projects, this sandpaper will suffice for final smoothing before the work is finished.Medium sandpaper (60 to 80 grit): Primarily used to sand rough wood and remove scratches and planning marks.Coarse sandpaper (40 to 50 grit): Used to roughly shape wood and remove old finishes, such as light coats of polyurethane.Extra coarse sandpaper (24 to 36 grit): Used for removing paint and varnish, sanding old floors might also require extra coarse sandpaper.Manufacturers may indicate sandpaper grit by the number or by describing it, so it’s helpful to know what each description means. Can remove scratches from lower coarse grits.Light sanding between drywall coats or other finishes.Can remove scratches created from coarse grits.Smoothing wood surfaces prior to painting.Sanding extra rough and uneven surfaces.Make sure to check out the ‘common uses’ column if you are unsure of which grit to use on the project, and always test an inconspicuous spot or scrap material when using new sandpaper. Here’s a quick reference that will help you find the right sandpaper grit for the job at hand. FEPA sizes are not identical to CAMI sizes, but you can find a very similar option by selecting one of the two closest FEPA numbers. Grit sized with the FEPA scale is indicated by the letter “P” preceding the grit number. Most sandpaper follows the CAMI scale, but if you order sandpaper online, you may run across sandpaper grit sized by the Federation of European Producers of Abrasives (FEPA). The higher the number, the finer the sandpaper grit. In the United States, grit is determined based on a gradation scale established by the Coated Abrasive Manufacturers Institute (CAMI). RELATED: 9 Clever Alternative Uses for Sandpaper The particles (also known as grains or grit) are sifted through screens and sorted by size before being bonded with adhesive to a paper, sponge, or cloth-type backing to create an abrasive material. Sandpaper consists of fine particles from either natural or synthetic sources. It’s helpful to learn about different sandpaper grits, so you can find the right options for your next project. Usually more than one-and often three-types are needed for most projects. Coarser grits are used for heavy sanding on rough and uneven surfaces, while fine grit sandpaper is used to polish and finish the surface of materials. Therefore, a sheet of 220-grit sandpaper is more coarse than a sheet of 400-grit sandpaper. Generally, the lower the grit number, the more coarse the grit. If the rest of your panel is smooth, you just need to feather it in with sanding and blend it in.Each sandpaper grit performs a different job. You just need to prime over your main bodywork areas. Question: I’m painting over original paint and scuffed with 500-grit, do I need to primer the entire panel or just where the work was done? You can get away with 60-grit but you need to make sure to lay it on, using a 1.8 tip size spraying it nice and thick. If you’re using filler primer, you can go over with 80-grit. Question: How deep of a scratch will a filler primer be good for? Lastly, wash it with 400 to 600-grit and you’re ready for paint. Then, use 220-grit and cut it down with 400-grit. ![]() You need to cut it down with 150-grit and then, put a 2K filler primer on it. Should I start sanding with 80-grit then filler? Question: My top clear has faded and has scratches. ![]() You won’t have problems, it will just cure and dry out. It is not recommended, however, you can use lacquer thinner to reduce base coat. If you are using DuPont products, stick with a DuPont reducer. I normally suggest sticking with the same brand. Question: What brand name would you recommend for a reducer to keep around the shop to add for primer or something that would require thinning? However, you should be okay if it cured for a couple of weeks, but it might wrinkle. If you want to use an automotive clear coat, I’d spray automotive base coat because you might have a reaction clear coating a 1K base coat. They have a model car rattle can paint and 1K clear coat that you can use. Question: What is the best way to spray clear on my model cars? We are back in the house with another auto body Q&A! Today’s focus is primer types and sandpaper grits to use for each. I hope you enjoyed the video! Secure your LearnAutoBodyAndPaint VIP slot now and be part of the #BossPainter community! ![]()
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