Great Stuff Gaps & Cracks Insulating Foam Sealant, 12 oz. is a no-shrink, minimal expansion foam designed to fill gaps and cracks efficiently. This versatile foam not only insulates but also bugproofs, caulks, waterproofs, and seals various surfaces. It adheres well to materials like plywood, styrofoam, urethane foam board, glass, and most plastics. The foam can be painted or sanded once applied, making it i for finishing touches. It is for sealing and insulating vans and campers, ing a tack- surface in just 45 minutes and fully curing within 8 hours. With a 2-year shelf life and UL classification, this product contains no CFCs, ensuring an environmentally friendly choice for your sealing needs.