Fiberglass Repair Help

The real fix is to grind it out repair any damage, fill and refinish. A die grinder works well for this. If the damage goes deep enough, you need to get behind it and lay in some fiberglass. It is very doable if you've done any bodywork and are willing to learn a bit of fiberglass work if needed. I suspect you are going to find it is more cosmetic than anything. I don't think stop drilling it is going to do much for you as fiberglass cracks don't propagate in fiberglass like aluminum. The "paint" they use when molding fiberglass is called gelcoat. It is thick stuff that is sprayed into the mold befor the fiberglass goes in. The fiberglass, when laid into the mold sticks to the gelcoat as the exposed surface remains tacky after "drying". It almost looks like the gelcoat or gelcoat and a layer of thin fiberglass have separated. I used to work with fiberglass a lot so I've seen a bit. If you do and up having to do glass work in the interior of the RV I would recommend using something other that polyester resin (epoxy may be better). The smell of polyester resin inside an enclosed place like an RV will linger a long time and could cause marital strife. It is one of the more potent and permanent stinks I know of. If you feel you are in over your head I know of an RV repair place in Fife (Wescraft) that did an excellent job on an insurance repair of my fiberglass overhead from a rock strike.