I'd cut a few holes through the inner layer of glass with a 1" holesaw, just through the glass, and see what you have underneath. I bet it's worse than you think.
I agree with Tunnels though, quick fix after quick fix is just wasted time and money. Best way to dry boats out is to leave them somewhere in full sun, rig a cover with a strongback and leave the ends open for good air flow. I got a plywood Diamond yacht to lose 100kgs doing that. more