Fiberglass cloth for transom

[RidgeRunner]

Thanks, It has been a while since my glass project. I couldn't agree more,
bubble buster rollers are a must. I also liked to use the 7" x 3/8" pile rollers to put the resin on out of the reuseable plastic pales. You can cover a lot of ground quick with minor cleanup to the roller frame and the resin can be popped out of the pale after it kicks.
I have been told, Epoxy resin is great to use over vinylester or polyester resin but you can't use poly or vinyl resins over the top of epoxy as it won't bond. Is this true and what limitations does epoxy have with respect to your topcoat?
(ie can you put gelcoat over epoxy or must you use a urethane?)