Dowsil 1200 OS Primer Clear is a silicone-based adhesion promoter designed to enhance the bond between silicone sealants and non-porous surfaces such as glass, metals, ceramics, and certain plastics. Supplied in a 309-gram bottle, this primer is low in viscosity, easy to apply, and dries quickly at room temperature. It helps improve long-term adhesion and performance in both structural glazing and weatherproofing applications. The formulation is low in volatile organic compounds and uses ozone-safe solvents, making it suitable for use in sensitive environments.