Lanco Stop Leak Red 10.1 oz CC648-18Seals: Metal Fiber Cement Concrete Wood Asphalt For Interior and Exterior Use Uses: Stop Leak is designed to seal all types of cracks and leaks on any smooth surface. Used on walls and roofs, around pipes and penetrations in a building, around flashing and broken tiles. Excellent for fixing expansion joints and contained wall joints, sealing plumbing or electrical intakes. To use on metal, concrete, drywall and wood.