Re: Partially filling a void
but the bolts pass through two layers of plastic
Can you improve on that description?? Are the two layers of 'plastic' part of the boat? GRP?
Depending on where/what it is exactly I'd probably fill it with long strand fiberglass filler aka 'carpatch'
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
1984 Fast/Nicholson 345 "FastForward"