I would slap a layer on the bottom to seal out the moisture...which is what the varnishing is all about to begin with. It shouldn't interfere with the sealant, as long as the varnish is well adhered and completely dry before you apply the sealant. It will also, probably, help keep the varnish on the other sides in better shape, since moisture getting underneath the varnish is a big source of varnish failures IIRC.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.