Necro and I along with many others had this discussion a few years back. I originally built a tank using ames sno seal. The coverage was not quite as good as I hoped. The tank was a 2x2x4 100 gal plywood. It successfully held water but over time it degraded and bubbled. It eventually qwould have failed completely had I left the tank running but it last for about a year. I would not put any sort of pleco in a tank using this stuff.... At any rate, there are many other products that have proven to work that are just as inexpensive as Blue Max when you finally break the pricing down.
I even started a thread because of that discussion and built another 100 gallon tank using another product in the same price range because ames wasn't readilly available and after shipping it was more expensive than local products. I honestly don't know of a tank other than mine to be finished and working with any ames product. Other products to look at would be fiberglass, insul-x, etc..
However, if you choose to use blue max please document it for the rest of us.