You can use a Scotchbrite pad to scuff the surface - this will be enough to get the fill coats to adhere. If you have any rough/sharp glass edges, avoid using the Scotchbrite pad around them because they'll shred the pad and leave green bits for you you to pick off (assuming a green pad). You can hit those areas with 100 grit sandpaper by hand. Wipe off the dust with damp paper towels, and then get any remaining residue with some denatured alcohol (or mineral spirits, but it takes longer to evaporate). After it's all dry, you can apply the epoxy fill coats (rolling is quick and produces a thin, even coat).

Ross

: i read the epoxy book by system three....IIRC, silver tip with the slow
: hardener doesn't blush. i know that there's probably outside contamination
: because i put it in the pool to see if it floated...STUPID me. my big
: concern is that the wetout coat has been left for weeks to cure because i
: was in maine, so i don't know if the fill coats will adhere to that

: sorry if i'm leaving out any details that would be helpful. this is the first
: time i've ever tried a project like this.