You really need to give a little more information on what are your sanding for,paint removal,after priming,do you want to go down to the base metal? If your going down to bare metal through paint and primer start off with 60 or 80 and when you get through the heavy stuff move up to 220 or higher you just want to minimize the amount of grooves you put into the bare metal.Give some more details on what your doing so we can understand what your trying to do.
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