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F4P's General Purpose Expanding Foam is a ready-to-use polyurethane straw dispensed foam formulated for filling, insulating and sealing gaps, cracks, and openings in the interior and exterior of buildings. The multi-purpose formula creates a durable, airtight and waterproof seal that stops air infiltration, provides high insulation value and saves time and energy. It has excellent adhesion to most building surfaces including wood, glass, metal, masonry, and plastic. Available through your local City Electric Supply. Click here to find a branch near you. Learn More