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ddsmith mentioned West System Epoxy, Boat epoxy does not contain the vital UV inhibitors need to protect the wood on it's own. You have to top coat it with varnish of some type to gain this. Smith's Industrial makes a really thin epoxy that does a great job and penetrates into the wood pores well. Top coat this with a spar (marine) varnish and that's about as good as it gets. Air movement is vital in preserving wood so make sure you remove that toneau cover once a week and let the bed air out. If you don't want to mess with a lot of epoxies and varnishes, try Silkkens Cetol. Its a finish that you brush on and it penetrates and leaves a surface finish. Really seems to work well. I know people who use it on log lawn furniture and log homes and that's a lot of exposure, they swear by it.
motoretro
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