Soudal Genius gun Beige Expanding foam 750ml.This water resistant fast curing expanding foam from the Soudal Genius Gun range by Soudal has been specially designed for filling sealing and insulating most building materials around the interior and exterior of your home. It comes in an easily storable and transportable aerosol and expands to the exact size of the cavity you need filling. If you\'re using it during redecoration projects it\'s sandable and paintable making it perfect for giving a smooth professional finish once dried.