Sounds like you have the old polyester over epoxy incompatibility concern.
You need to remove the uncured polyester by whatever means you can, first.
Patch a piece of cloth in over those areas with any finishing epoxy or CA because epoxies cure over polyester.
Z-Poxy Finishing Resin, from Pacer, cures over polyester and epoxy and is easy to sand. It doesn't have the strength of WEST Systems though.