Join Date: Sep 2008
Location: Victoria B.C. Canada
Thanked 109 Times in 100 Posts
Rep Power: 10
My feeling is that the backer should be permanently attached to the hull. Easy to do with fiberglass or plywood using thickened epoxy.
I'm not sure about the Densetec but I don't think many sealants will stick to it and I'm certain epoxy will not.
Living aboard in Victoria Harbour