Leave it up to Rivermud to prove someone wrong.. I'm still waiting to see your experiment with the tank your are going to do..lol
That guy in the thread you posted never even filled up that tank if you read it.. he got another one and it was glass..
Here is a quote from a guy that posted in there..
I have always been dubious, probably more than I should, of the Formica lined tanks. Some of the Collins Aquarium tanks had water bubbles behind the Formica, and at least one had a peeling section of Formica, however it didn't seem to be leaking. The resin adhesive that should have been holding the Formica still seemed to be
waterproofing the plywood even if the Formica was no longer sealing the tank.
It's just too big of a gamble for me to ever see fit for a tank that is supposed to last years and tears..
As Pharaoh said. I have worked with that stuff for a long time and i just don't see it doing the job..
There are many other water proofing methods that are not that expensive really..
I'm still waiting for someone to do a tank with truck bed liner as the initial shell, and then a couple coats of epoxy paint over that.. I'm betting it would work fine..