I have an Impex Assateague, and the front hatch has a small leak. Impex
uses Valley rubber hatch covers. I can't pinpoint it for sure, but I
think it is leaking where the gasket on the bottom is fixed to the
fiberglass, not where the rubber cover fits over the gasket. I was
thinking of trying to fix this by putting a very thin bead of silicone
caulk along the edge where the gasket meets the body of the boat. The
dealer says it might require a minor fiberglass repair. Anyone have any
experience fixing this sort of thing?

Many thanks.