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According to this site: The weight of the backing is usually designated by a letter. For paper backings, the weight ratings range from "A" to "F," with A designating the lightest and F the heaviest. Letter nomenclature follows a different system for cloth backings, with the weight of the backing rated J, X, Y , T, and M, from lightest to heaviest.


Sanding with or against the grain doesn't matter much until the last sanding stage, if that. Lots of us use random-orbit sanders which sand in all directions at once, and that works Just Fine. The first sanding pass, with the coarsest grit sandpaper, does most of the work of levelling the surface; ideally, it should leave you with no scratches larger than ...

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