Reply To: foam hollow spaces.

Completly refitting my HT 26, I removed all the foam from “NDNM” . She was full of rain water, probably for years. After removing the floor, I noticed than the foam was quite dry on the center, but on a thickness of one or two centimeters all around (floor and hull) it was full of water, even after 2 years under roof. The smell was awfull and I think than on a long range, such water can affect the polyester structure.
As in France boyancy product must be stuck to the structure, I can't use empty bottles. I am using polyester sandwich panels (used to built frigo trucks or frigo building) with foam between two GRP sheets. You can arrange pieces free or cheap from truck body shop or from frigo builders. I use them, stratified to the hull with epoxy, making the crash box very stronger than with only foam.
Bonzo is right for the product in two bottles : products in one can are easy to use, but not so good than those needing a mix on the spot.