The canned spray foam will not work well, too low a density. You can get the proper stuff at a boat building supplier.
What fish are you hunting? How deep the float goes determines the foam density.
Cheers, Don
Its mainly our beach diving float for when I swim out from the beach, I dont have a reel rigged on any of my guns so its got a 50 ft floatline right to the gun handle. I doubt it will be ever going very deep or getting tombstoned since Im only hunting fish in 25-40 feet of water most of the time.
edit - dan, thanks for that link. You got the DIY stuff down pretty damn good sir![]()