Polyurethane vs. Marine varnish

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#1
I had a guy build me a custom cabinet and hood for my 300 gallon tank. Just wondering whats going to be the nest way to protect the wood? Itll be stained a dark brown. Should i use a marine varnish similar to what is used on wood boats? Or would polyurethane work better? Any advice is appreciated. Thanks in advance.
 
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#3
Do some test pieces before you do the entire thing. A lot of the marine varnishes are high gloss and you may not like that look.
 
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#5
I’m not sure about the outside over the stain, but on the inside I use a bilge paint. It’s made to get wet and hold up.
 
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