Sto AirSeal® is a fluid-applied vapor permeable air and moisture barrier (AMB) product that is part of the StoGuard® family of products. It can be used behind StoVentec™ RainScreen®, StoTherm® ci, StoPowerwall®, StoQuik® Silver and other wall claddings such as masonry, stone, stucco, and fiber cement. It is used over prepared vertical above grade wall substrates such as concrete, concrete masonry, and glass mat gypsum, plywood, or OSB sheathing.