Polyester is a huge catagory of finishes far beyond the fiberglass laminating stuff with the little bottle of hardener available at boating stores. I can't remember the exact brand but I ran into paddles and canoe wood parts coated with polyesters that were like wood coated in plastic. I'm not a chemist but if you do a search, your computer will explode with all the hits and various polyester coatings out there. They are usually not for the home builders because they get sprayed and can kill you.
EZ-Dock modular docks
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