based on older salts advise, ive used products from "Ameron" (sp?) with great success and a 1/3 the price of typical west marine/boat us/boaters world merchandise. saw the larger yards in San Fran Bay area using the stuff on fishing trawlers and larger sailboats .the huge chemical company has a web page (use google.com to search) so you can get the specs/data sheets. They produce a wide array of commercial chemicals targeted for commercial marine applications. no pretty labels or fancy adds in the mags, just excellent products well below mainstream retail pricing. i used one of their
epoxy barrier coat products on my 34'' and would not go back to pettit or interlux (after 30yrs experience w/both)