Introducing Drybase Damp Proof Liquid Membrane - a hassle-free solution to barrier coating. This pre-packed, black liquid comes with a consistency similar to thick emulsion paint and requires a two-coat application. Once applied, it turns into a flexible, elastic membrane that provides a barrier to damp and ground gases including radon, carbon dioxide, and methane. Plus, it's water-based and can be applied to damp surfaces with a brush, roller, or spray. Get touch-dry results in just one hour!