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Humblefish

Sealing plywood

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However, I’m not comfortable putting the tanks directly on the metal grating so I plan to use 3/4” plywood all the way across to more evenly distribute the weight.
 
Obviously, the bare plywood will not last long if it comes into contact with saltwater; so I’m looking for a cost effective sealer to use on it. I like using this varnish on my “good stands”, but it will get kinda expensive using it on plywood: https://www.homedepot.com/p/Rust-Oleum-Marine-1-qt-Clear-Gloss-Spar-Varnish-Coatings-207008/202520882

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Based upon my calculations, I could seal 2 sheets of plywood using the marine varnish I linked above.
Covers up to 125 sq. ft. per quart
 
4X8 sheet of plywood = 32 sq ft X 2 (both sides) = 64 sq ft (or 128 sq ft for 2 sheets)
 
At $13.57 per quart, it would cost me $6.78 to seal a $32 sheet of plywood if I went this route. Just curious to know if there are more cost effective options to consider. TIA

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TrentN   

You could use epoxy paint. In fact on garf.org it shows you how to make a plywood tank with epoxy paint. Next best option is that Flexseal paint. I used it on the catch tray for my sump, but you don't brush that stuff on, use a wide putty knife. Real thick.

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So I tried this one coat stuff today, goes on like Elmer’s glue, I wouldn’t use it if the temp is under 110 out side. Went back to old faithful fast dry 4cc363752b1325aad899dc5fb61e30e6.jpg


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