Not the first because the guy on my job site said he was??. Calgary deck & rail inc
http://www.calgary-decks.com/ This stuff is bomb proof literally and if i remember depending on the thickness it was around 7$ a sqfoot. Personally I think it's overkill for interior. Tile guys (good ones) use a liquid rubber roll on product for showers that is about 500 a 5gallon pail.