789 Weather Silicon Sealant is a neutral cure silicone sealant particularly suitable for interior & exterior sealing applications such as joints, weather sealing, and connection Joints. It is designed for general weather sealing. It easily extrudes in any weather and quickly cures at room temperature to produce a durable flexible silicone rubber seat. 789 Weather Silicon Sealant is easy to use and forms a strong bond to most common building components without the use of a primer.