Re: Replacing pontoon deck'
Another source of bolts is a chain store called Fastenal, Inc. We have 3 locations in our town selling in bulk at very reasonable prices. And, it takes a bunch of nuts and bolts to put down a pontoon boat floor. I would use the same fasteners the boat had on it originally.
I'm with you on the Epoxy floor paint, and marine plywood being very expensive @ $75 a sheet. I used gloss enamel paint on regular plywood a few years ago, and those panels have disintegrated on each side of my motor. I'm going to pull the fence up a little, and just replace those two pieces--still not a little job. The rest of my plywood is still good after 26 years' usage.
I may use elastomeric primer and coating coating both sides, like they put on mobile home roofs. I've been using this on my travel trailer roof with great success. And, it stretches with freezing, etc. And, you can buy it cheaply in small volumes at any home repair store--quarts and gallons.