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Here's that door again after being roughly sanded to shape using the DA sander with 40-grit. The filler on the door still needs taking down further, but owing to those 40-grit swirl scratches, enough filler was left in order to take it down again with 80-grit on a block, eliminating the scratches. Some bodymen prefer to start with 80-grit. It comes down to preference and how you were taught, but however it's done, progressively using finer grit paper is the way to go.