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- InsulationWasser Polyflex 204 is a high performance membrane of Polyurea. It provides excellent insulation and is resistant to a variety of chemical products. It can be used in a wide range of climatic conditions while continuing to offer excellent durability. Applications are done primarily by brush and roller. Due to its aliphatic nature the product is suitable in exterior applications. It has high solid content and remains flexible. While it can be used as a repair kit, it can also be used as a complete water proofing membrane.