![]() ![]() Specifically, 320-grit sandpaper sheets are the coarsest option you can use to sand the car surface before you apply the primer. Progressively finer grits (180-600 grit) refine the surface and help to hide the repair by seamlessly blending it into the surrounding body work. Coarse, rough grits (40-100 grit) remove a lot of excess material like body filler quickly and easily. But in the fine grits, the difference is huge. Any sandpaper below or around 500 grit is ideal for quickly sanding the primer layer and removing the upper car paint surfaces. So let’s say we have a sandpaper with a grit size of 30, then that means 30 particles would fit through the filter. Sandpaper comes in dozens of textures, or grits, to do required job. Some paper is treated with a soap-like substance to reduce clogging ( stearated or nonclog. Sandpaper Grit Scales 0.00003937007874 Description Scales Very Coarse Very Coarse Coarse Coarse. As can be seen, it is only when using finer grits that the difference need to be considered. On closed-coat sandpaper, the grit covers 100 of the surface on open-coat paper it covers 50 to 70 of the surface, the advantage being that the paper doesnt clog as easily. What it shows is two colored sections, a section where the difference is small enough to not matter too much (green) and a section from where difference is huge and must be thought of (red). See a sandpaper grit chart with the most common grits and their corresponding numbers in the FEPA scale. Find out the common grits, their numbers, and their applications in this comprehensive guide. The below table is originally from Wkipedia, but with some slight changes. Learn how to choose the right sandpaper grit for your project based on the size of the abrasive particles and the surface you are working on. ![]() Table comparing sandpaper grit standard in Europe and USA
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