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For super durable workbenches I start with a single coat of an oil-based wood primer like Kilz, then two coats of black spray-on appliance epoxy. This stuff is really really nasty (the solvent is a mixture of acetone, petroleum, xylene, and butyl acetate). You'll want to do it outside and with a respirator + organic vapor filter, goggles, gloves, disposable clothes etc. If you do it inside you'll end up with a black residue on everything that will never come off. But this surface is incredibly durable. It doesn't scratch, ever. You can hit it with a hammer and it won't leave any sort of impression. I cut stuff with razor blades on it frequently and it doesn't leave any marks. Resistant to direct flames for a short period of time. Also, its resistant to acids and bases. I've tested it with glacial acetic, sulfuric, 12M HCl, 10M NaOH, and 10M KOH. The only things I've found that will eat through it are Piranha solution and cesium hydroxide solutions (don't try this without a fume hood and chem lab training/experience).
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There are also 2-part epoxy products meant for marine use which would probably work better than appliance paint but are more expensive
https://www.jamestowndistributors.com/userportal/show_product.do?pid=3842
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-Nathan
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