Paint and felt for a roof liner?

Today I went to a salt water disposal here in North Dakota. Usually the disposals use a epdm liner to make a waterproof holding area in case a tank burst. This disposal used something they said was a new technology. They took a material that looked like black felt, perhaps 1/8"-3/16" thick and rolled it out on the ground. They then took a two part chemical mixture and sprayed it on. It was an "A" and "B" component. This formed a thick elastic like coating that is completely waterproof.

I am not familiar with this process, but it got me to thinking. I remember an article, I believe by J.D. Hooker in a Backwoods Home magazine that talked about using a cotton tarp for a shed roof and painting it with an oil based paint to waterproof it. What if this was done to make a roof liner in a Wofati house?

I have purchased oops paint from the paint store for $1 per gallon. Perhaps use an oil based paint and apply it thickly over the felt to make a liner? Has anyone tried something like this before?

The felt is very forgiving to irregularities beneath it, and the paint would soak through it to make a waterproof liner. How well does enamel paint hold up underground?

Just a thought, this got my wheels to turning today.

Jeff H.

Search for "flying concrete" and latex hypar roof. Abe on here has a post on his vela creations blogs about it. Concrete and latex paint over fiberglass. It works very well, but you need to the shape to add strength.

The a+b stuff is similar to truck bedliner. Not cheap--but a lot easier (less labor $$) to deal with than big EDPM and no welding seams.

On Thursday I went back to the same disposal and the crew from Texas was there finishing the liner job it had started. They said it was able to stretch 600% and cost about $6 per square foot to apply. That would be a little beyond my budget! EPDM or TPO would be a much cheaper alternative.