I'm only going use the glass on 3 sides. Bottoms and backs are usually plywood.
Properly treated, it lasts forever. I built a few boats before tanks and just incorporate the same waterproofing and treatment in the tanks. Some sealers have to be changed for toxinicity, but 2 part epoxy paint works great and can last for 20 years if your careful. I'll tell you one thing, this makes drilling and plumbing a breeze!!
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