Water Proofing A Canopy?

Hey guys.. I recently put together my wooden canopy and gave it about 3 coats of Lacquer... I had the new 40 gallon running for about a month into the cycle and i noticed some mold starting to grow on the inside corner... Its getting wet from poping bubbles..
Anyone have any fast solutions to water proof the inside?

Thanks

 

epoxy paint, or that rubberized paint they use in flower pots

 

Awesome TY... I assume they make it in spray paint? and what color you think will be best for reflecting light? or does it not matter?

 

Fiberglass resin would be perfect. If you want color, you could use Gelkote & tint it what ever color you want. Either resin will stick to wood the best.

 

I went to Home depot and they said the only thing they had was a 150 dollar bucket of epoxy garage floor concrete... They were a bit perplexed... Any specific brands or maybe some type of standard paint/spray paint you could recommend?

 

Here is what I used. Never had mold

Minwax® Helmsman Spar Urethane - Oil-Based Clear Protective Finishes - Minwax.com