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• Are solvent-based, with a life expectancy of two to 10 years.
• Butyl rubber is good for sealing out water in lap joints, such as gutters. It is also a good choice for metals and masonry, as well as outside for chimneys.
• Probably the best waterproofing sealant for below-grade applications, such as foundations.
• Stringy, difficult to apply and slow curing, they are most efficient when applied to openings between similar surfaces.
• Not recommended for openings wider or deeper than 1/4" or in 90° corners.
• These sealants offer low to moderate movement capabilities.