Bighurt and I have recently become aware of the potent waterproofing capabilities of Drylok masonry waterproofer. Here are some anecdotes from the Cichlid-Forum.

1) Some guy builds a 90 gallon box from melamine, thinking that it will hold water. Not surprisingly, it fails after about 48 hours. So he paints it with some latex based Drylok and it has held water since about March.

2) Same guy has since built a handful of large tanks, including a 1100 gallon tank that is 12' x 5' x 2.5' -- it has also held water for months.

3) Another poster built a plywood tank and applied Drylok directly to it. It has also held 90 gallons of water for months now.

I guess my point is don't worry about this too much. Build the pool as best you can and buy some cheap latex-based drylok and seal it up. It comes in three basic colors and can be tinted a bit. At $22 per gallon it's hard to go wrong.

Make sure you don't buy the oil-based drylok. I think it is also considered potable water safe, but it is said to be nasty to work with.
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Current snakes:

0.0.1 Gonyosoma oxycephala - Java locale (green)

1.2 Gonyosoma oxycephala - Jave local (green)

2.2 Gonyosoma janseni - Seleyar locale (all black)

1.2 Gonyosoma janseni - Celebes locale (Black & Tan)

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