BASF MasterSeal TX 1, formerly Sonolastic TX 1, is a one-component, no sag, textured, moisture-curing gun-grade, elastomeric polyurethane sealant. BASF TX 1 requires no mixing and typically requires no priming to many common building materials. BASF TX 1 is a popular polyurethane sealant which gives a textured appearance which blends well with masonry substrates, is weather resistant which provides a long lasting weathertight seal and, due to it being a high quality polyurethane polymer, it resists hardening with age. BASF TX 1 is ready to use and requires no mixing which reduces labor cost. Joint movement capability is ±25% which allows for excellent flexibility for keeping moving joints tight. BASF TX 1 is compatible with non-rigid coatings and can be painted. Gunning and tooling BASF TX 1 is easy which speeds application while making neater joints.