Gelcoat over epoxy?

[shine]

I can help on thi one

gelcoat/polyester WILL cure over some epoxies. You have to make certain its compatible. The epoxy has to be completely cured too.

Do not mix epoxy outside of its designed ratio (hot), all your doing there is introducing more hardener molecules than needed and the epoxy will not cure fully or even at all. The hardener in epoxy is not just a "catalyst" like in polyester, its actually part of the combined epoxy molecule. Catalyst for poly basically "tells" the polyester molecules its time to become hard. Epoxy resin and hardener are more like couples at a dance, mix in too many males or females and you end up with leftover resin or hardener with no where to go = soft epoxy.