3M Scotch-Weld Structural Adhesive Primer 3901 is a one-component, metal and glass primer designed for applications using 3M Scotch-Weld film and liquid structural adhesives. Formulated to improve metal and glass adhesion, this film and liquid adhesive primer simplifies production scheduling by protecting the cleaned surfaces until the bonding operations can be completed. This product also offers resistance to environmental exposure as well as provides improved corrosion protection to metal. 3M Scotch-Weld Metal Primer 3901 features low viscosity for ease-of-application and ensures complete wetting of the film adhesive to adhered surfaces, providing an ideal application surface. Recommended Applications Glass and metal applications Protects Cleaned Surfaces until Bonding Operations can be Completed For those applications using 3M Scotch-Weld Structural Adhesives, 3M Scotch-Weld Metal Primer 3901 ensures that surfaces remain relatively free of oxidation until the bonding application is completed. Protection from and resistance to corrosion and environmental exposure is key to successful, long-lasting adhesion.