Wurth Expanding Foam Sealant - Gaps & Cracks 1" is a high quality sealant that effectively fills gaps and cracks up to 1-inch in size. The 12 ounce can is airtight, water-resistant, and weatherproof, which reduces drafts and seals out air, moisture, and pests. Wurth Expanding Foam is versatile as it can be used in sound insulation applications, thermal insulation, structural vacancies, engineering holes, and many other various gaps and cracks. It is also energy efficient and works in low-temperature settings. The foam is dust proof, which ensures excellent adhesion. The time to cure and be tack free is only 10 minutes, and the foam can be cut, polished and/or painted after 60 minutes. It is applied in a quick, simple and convenient 3-step application: shake the can, screw on the straw, hold upside down and spray.