Grit numbers range from 24 (extra-coarse) all the way up to over 1000—though most home improvement projects use sandpaper in a much smaller range, from roughly 60- to 360-grit. It's a common ...

Then we went to “boot camp” at 3M and learned there's an easier ... to match the contours of the car body using 80- and 180-grit sandpaper. Then feather the edges of the filler right up ...