Moisture-curing, expanding Polyurethane Foam sold in a 750ml gun grade can. This Soudafoam is a gun grade expanding foam that is excellent for gap filling around frames. Can be trimmed once cured. Can only be used with specialist gun applicator (sold seperately) which makes it suitable mainly for professional users. For single applications and general domestic use, the hand held aerosol version (EXFOAM) would normally prove more economical.