SX Contractors High Yield Expanding Foam for filling, fixing, sealing awkward gaps, hollows and cavities. Hand held, it shoots liquid foam deep into cavities and expands, creating a long lasting seal, which insulates against heat, sound and moisture. Suitable for inside or out, it can be easily trimmed and sanded ready to be painted, filled or plastered. Contains a CFC - free propellant. Tools required - gloves, water spray, knife.