Polycell PLCEF825 Expanding Foam Polyfilla 825ml Polycell Expanding Foam Polyfilla is ideal for filling and sealing awkward gaps hollows and cavities. It shoots liquid foam deep into cavities creating a long lasting seal which insulates against heat sound and moisture. Suitable for internal or external use it can be easily trimmed and sanded ready to be painted filled or plastered. Contains a CFC - free propellant. Size: 825ml.