Soudal Beige Gap filling expanding foam 500 ml. This 500ml water resistant fast curing gap filling expanding foam from Soudal has been specially designed for quick & easy filling of gaps joints holes & pipe penetrations around the interior & exterior of your home. Simply apply & leave for 1½ hours for a bead of 3cm to dry. It comes in an easily storable & transportable aerosol & expands to Approx. 30 times the size of the can. If you're using it during redecoration projects it's sandable & paintable making it perfect for giving a smooth professional finish once dried.