How to repair a hole in a fiberglass boat when it continues to seep water?

Do not use BONDO..(which is polyester resin) to repair...You need to use Epoxy resin. Polyester resin is fine when you build a boat, but for repairs get a West systems epoxy kit. The nice thing about expoxy is that it generates heat while it cures which will help dry out some of that moisture. Before you start tho, I would put a heat lamp on the area, or a heat gun, (use care to not get anything too hot) to dry our as much moisture as possible. Make sure you rough up the area where the leak is so that the repair will stick. West systems has video and phamplets to show you how to use it. You can use filler to thicken the epoxy and even lay down new fiberglass cloth to reinforce the area. Epoxy can be blended and sanded with grinders and sand paper to blend in with your hull shape. Consider which side of the hull you want to "plug" Sometimes it's best to do the inside. I repaired a front keel area on a bass boat that was worn thin by someone pulling the boat up on sand or rocks. The ...  more