oblrman;3665367; said:
Thanks Pharaoh. Just curious: why dont you think that formica will stand up to submersion? Have you seen/heard a disaster? I appreciate the info!
There was a pet shop in Ohio that had several plywood tanks sealed with formica or some other high pressure laminate. This was back in the late 80's and the tanks were already at least a few years old. My understanding is that they held water for years but eventually did start to fail. Some of the damaged ares has silicone troweled over them and they did fine.
Unfortunately the standard formica used back then was of much higher quality that what you can get today. In the last few years a professional installer did a comparison and showed how even commerical quality HPL made today is nowhere near as thick as what you could find in a 70's era kitchen. I'll see if I can find that link. It was on a woodworking forum. They also use more waterborne resins in today's products due to VOC regulations.
You're much better off using a solid plastic sheet of some sort. Fiberglass reinforced panels (FRP) have been used and ABS like another poster suggested would also work.
I would have a slight preference for solid PVC over ABS for lining a wooden tank. The caveat here is that it only comes in dark gray, like gray PVC pipe. ABS and the similar high impact styrene at least comes in a lot of colors.
Be sure to avoid any of the various expanded PVC products. These are waterproof and are also cheap, easy to work with and readily available. However, they consist of a foamed PVC interior sandwiched between two layers of thin solid PVC.
They would certainly waterproof a tank but if a rock punctured the inner PVC skin your chances of a leak increase dramatically. And there is also a chance that water would penetrate the foamed interior and cause blisters that could be another point of failure.
Unfortunately when shopping for solid PVC sheet you're more likely to find expanded PVC. Just be careful not to confuse the two.
Wonderful material for reptile cages but not something I would use for lining a tank.