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How to sand concave topographical surfaces without buying a fancy foam-padded attachment for your Random Orbital Sander
Cut Polystyrene into a circle the same shape as your pad
use spray adhesive to attach hook&loop paper with the fuzzy side out.
attach sanding disk (sand paper out) to the other side of the foam. now you have a thickened piece of sand paper backed by foam that can follow con...
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