www.laticrete.com The product they used on the show is called Hydroban by Laticrete. It costs about $300 for a 5 gal pail and will cover 250 to 300 sqft. It can be brushed/rolled on but all of the joints and penetrations should have a gap of 1/8" or less. Anymore than 1/8" ant the product will sag and not seal properly. If anyone has any questions on this product I have used it before in may commercial applications and on my own personal walk in shower.