Parex USA WeatherSeal Trowel-On is a high performance vapor permeable water-resistive & air barrier membrane for above grade use. The WeatherSeal Trowel-On has been thoroughly tested and is ABAA evaluated. All in one and ready to use for wall joints, rough openings, flashings and sheathing. It can be applied over a wide variety of substrates and under EIFS, stucco or any code approved cladding.