Thanks for the info, Minh.

However, one thing to keep in mind is that the wood is not going to be in contact with the water. The gallon of epoxy that I am going to use will cover an area several times bigger than the inside of the tank to a thickness of 6 mils. I am going to use two gallons and possibly a third. The epoxy layer will be between 1/8" and 1/4" thick. Epoxy is a resin like acrylic and just as hard once dry. I don't foresee this as being a problem.

Thanks,
Mark