EVO-STIK Expanding Foam Filler is a one component polyurethane foam curing by air moisture, applicable with annexed straw. It expands rapidly to fill and seal holes around window and door frames, or in brickwork, rendering and plaster - then hardens ready to be trimmed, cut, sanded and painted. Suitable materials: Most building materials such as, concrete, plaster, brick works, wood and many plastic materials Sizes: 500ml (SKU 30810641) or 750ml (SKU 30810642) Colour: Light Yellow