This 600ml Gap Filler Expanding Foam Genius Gun is a moisture-curing, polyurethane expanding foam for all general-purpose gap filling applications. This gap filling expanding foam adheres to most common building materials and is highly resistant to water, heat and ageing while offering excellent thermal and acoustic insulation. Ideal for general filling and insulating of holes, voids, gaps and joints in most construction applications, this hand-held PU foam features the patented 'Genius Gun' trigger mechanism to enable high-precision, single-handed use. The re-sealable applicator can be re-used for up to 6 weeks after first use. This expanding foam can be cut, sanded, plastered and painted after full cure and is ideal for the installation of doors and windows, sealing pipe penetrations or for the creation of sound-proof sealing.