This high-performance, adhesive spray is formulated to bond overlay underfloor heating boards to new and existing floors. This includes concrete, screed, wood and tiles. The adhesive spray can hold 500ml and will cover around 5m2. If the subfloor is porous, like floorboards, a second coat on the underside of the boards is required, this reduces coverage by half. Its fast-drying formula ensures excellent coverage and has excellent moisture resistance. Ease of Installation: Extremely tacky with a long open time. High Coverage: Ensures thorough bonding of area up to 5m2. Suited for EPS & EXP: Non-chlorinated spray, perfect for overlay boards.