Join Date: Sep 2008
Location: Victoria B.C. Canada
Thanked 109 Times in 100 Posts
Rep Power: 10
Best backing for through hulls is G10 or fiberglass, epoxied to the hull where it adds a great deal of strength in an area that couls use it. Starboard is just a washer as nothing sticks well to it, including sealant.
Living aboard in Victoria Harbour