Tradies Choice WPM is a Grey Class III fibre reinforced water based polyurethane membrane that has been designed for a range of waterproofing applications for under Tile. Can be used for wet areas , balconies and deck areas that are going to be tiled and not left exposed. Excellent adhesion to concrete , masonry , renders and internal cement sheeting and plaster board sheeting. For external sheeting such as Scyon the substrate must be primer with Tradies Choice moisture Barrier.