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Sometimes you may have to steel wool instead. Sometimes with epoxy there is a gummy kind of skin on there. Once the skin layer is removed , the gumminess goes away. Don't rub to aggressively as a little heat build up may also gum up the works. Fine sandpaper tend to load up anyway but its really "gummy" then my guess is you have the skin effect I mentioned. Sometimes wiping it all down with acetone and letting it dry completes the cure on the skin if its only the skin that's undercured.
Steel wool is nice cause you can keep folding and unfolding to keep exposing new , ungummed areas. I believe the fine stuff is AA. Anyway , be careful cause there are coarse and fine steel wool also.
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