A prominent wooden boat builder at the Maine Boat builders show has been using water proof automotive bondo for over 100 boats, won't mention his name but he was the first boat on the left, using it primarily for filling screw and nail holes. I used it on a strip built skiff that was glassed over and it's holding up fine. Haven't heard of any, on canvas, applications.
My only issue with Quick Fair is that you need to buy it by the tractor trailer load. It would be nice if it was available in smaller quantities.
Quick Fair is available in 24oz. Close, but not quite a trailer load. Lasts forever in the can. Made for marine applications.
http://www.jamestowndistributors.co...lyName=System+Three+QuikFair+Fairing+Compound
A house brand "Total Boat" fairing compound is available in 2 pint. I've used it, but like the QuickFair better...seems smoother.
Even though it allegedly holds moisture, it's not entirely unusual for restorers/builders to use a bit of bondo.
Mike, will you be christening the Gerrish the "Putty Princess"? or may i call you 007, licensed to fill?