Trouble with gelcoat

[Caymanboy]

Ifin it was me, I would use the Interlux underwater epoxy filler,, sand it, it sands well, apply two coats interprotect 2000, is the boat going to live in the water it's whole life? If it is I would put three coats interprotect, if it is just a w/e splash, I would consider not doing it at all.just fill with epoxy and bottom paint it, As said before polyester fillers absorb water. Thanks 3rdday, you know your stuff.