Join Date: Sep 2008
Location: Victoria B.C. Canada
Thanked 111 Times in 102 Posts
Rep Power: 10
If properly epoxied and epoxied to the hull plywood is probably a fair substitute for fiberglass. Fiberglass is easy to make, can be purchased, or can be obtained as offcuts/waste from a builder.
My job lets me see many boats' bilges and I can't recall wood backing blocks that were not soft and punky with age.
Living aboard in Victoria Harbour