Dow GREAT STUFF Gaps and Cracks 12-oz Spray Foam ...- Holes and Cracks Patching Spray Foam ,Dow GREAT STUFF Gaps and Cracks 12-oz Spray Foam Insulation at Lowe's. GREAT STUFF Gaps and Cracks Insulating Foam Sealant is the original gap and crack attacker. All those openings in your home are like tunnels for heat and8 oz. Aerosol Drywall Patch and Repair Spray SpacklingRepair drywall holes, cracks and gouges. Homax Spray Spackling is sandable, paintable and won’t dry out in the can, so it’s always ready for your next project. One 8 oz. can covers two 4 in. x 4 in. patches.