Gallon, Redgard Waterproofing & Crack Prevention Membrane, Ready To Use, Elastomeric, Waterproofing & Crack Prevention Membrane, Easily Applied With Roller, Trowel Or Sprayer, Meets ANSI A118.10. Meets Lapmo/Uniform Plumbing Code Specifications For Use As A Shower Pan Liner, Protected By Moldgard Technology To Resist Mold & Mildew Growth.