3M Scotch-Weld 3901 Metal Primer Adhesion Promoter for Epoxy Urethane Structural Adhesive Metal Glass Bonding

3M Scotch-Weld 3901 Metal Primer — Adhesion Promoter

The 3M™ Scotch-Weld™ 3901 is a high-performance metal primer and adhesion promoter engineered to maximize bond strength when used with epoxy and urethane structural adhesives. Applied as a thin pre-treatment layer, it chemically prepares metal and glass surfaces to ensure a tenacious, long-lasting bond — even in demanding industrial environments.

Key Features

• Significantly improves adhesion of epoxy and urethane structural adhesives
• Compatible with a wide range of metals including steel, aluminum, and stainless steel
• Also effective on glass and certain plastics
• Easy brush or wipe application
• Fast drying — ready for adhesive application in minutes
• Enhances durability and resistance to moisture and corrosion

Applications

• Pre-treatment for structural metal bonding assemblies
• Glass-to-metal bonding in automotive and industrial applications
• Surface preparation prior to epoxy or urethane adhesive application
• Aerospace, automotive, and general manufacturing

A critical step for professionals who demand maximum bond reliability from their structural adhesive systems.