Flowcoat do not stick so well on epoxy, and even worse on fresh epoxy. One option is to paint the transom with epoxy primer and coat with 2k PU paint. But if You want to have it covered with flow coat, you can try to "after" cure the epoxy first with heat, then wash with acethone, sand with 80 grit and then flow coat it.
How to remove the uncured flowcoat can be a pain.... or you can try cur it with heat and cover the surface with plastic film to eliminate any air to the surface, that might do the trick.
fun on a boat is inversely proportional to size...sort of anyway