SX Rainproof Acrylic caulk premium quality flexible sealant based on acrylic emulsion, which is immediately rainproof after application. Almost odour free and is not corrosive towards metals. For sealing and filling gaps and cracks where movement can occur such as those between wooden and metal window and door frames, painted wood, anodised aluminium, PVCu, brickwork, concrete and aerated concrete. After application it forms a soft flexible rubber type seal. Conforms to ISO 11600 F12,5P.