Aaronhoy,

For removal of cured glass, I find 80 grit paper and an orbital sander works best. Wait until the resin is fully cured though (at least overnight).

Also, I think you may be confusing "fully cured". Resins fully cure (for general purposes) in about 12 to 24 hours. They become tacky in about an hour or less (depending on what you`re using). It is quite alright (in fact desirable) to let the last layer get tacky before applying the next. This is not the same as fully cured. Also, do not use resin that is starting to gell in the mixing cup - mix fresh stuff.

Dave