SerGeybin Favorite Magic Wall Crack and Gap Foam SprayMagic Wall Crack and Gap Foam Spray Vira Polyurethane Foam PU Foam Spray Feature 1. Seals around windows, doors, siding and baseboard. 2. Fills cracks and joints, gaps around pipes, vents, utility lines, and electrical outlets 3. Seals and insulates the gap between the sole plate and the concrete slab. Directions : 1. Wear protective gloves, googles and work clothes during uses. 2. Clean surfaces of dirt, grease and dust then moistening the cavity. 3,