Re: surface prepuration question
Sandpaper backed with a block. Depending how bad of finish it is to start with but you might start with 220 and work through the grits up to 1200grit. Change your sanding directions each time you change grits and sand with that grit until you clean all the scratches up from the last grit. 220, 340, 400, 600, 1200. You can even take up to 2000 grit for a nice line polish. Find 1200 through 2000 grit at an auto supply store. It is used for wet sanding car paint.
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