HydroBond PVC Water-Based Adhesive is a water-based, wet lay-in, one-sided dispersion adhesive. Compatible with bareback VersiFlex PVC and VersiFleece® TPO, PVC and KEE HP membranes, this product is ideal for bonding membranes to various porous and non-porous substrates. (Cannot be used with KEE or KEE HP bare back membrane.) See coverage rates chart for acceptable substrates. HydroBond is used to secure membranes to clean and dry horizontal surfaces up to a 2:12 slope and as a contact adhesive in vertical applications. Above 2:12 slope, mechanical attachment is required, see details. This water-based adhesive is specially formulated to be in compliance with the state of California Clean Air Act of 1988 (updated in 1997) and as further regulated by California’s Air Quality Control District’s listing of VOC limitations. HydroBond also meets the requirements of the OTC Model Rule for SinglePly Roofing Adhesives.