3M Scotch-Weld AC77 Cyanoacrylate Adhesive Primer

3M™ Scotch-Weld™ AC77 is a fast-drying primer specially formulated to improve the adhesion of cyanoacrylate adhesives on difficult-to-bond materials with low surface energy, such as polyethylene (PE), polypropylene (PP), PTFE, acetal, and various elastomers. The formula containing a bonding activator accelerates the bonding and curing process, eliminating downtime and increasing production efficiency. The product is easy to use and designed for wide application in industry – from transportation and electronics, through the production of specialized vehicles, to the assembly of consumer goods.

Technical Specification

• Capacity: 1 liter
• Type: Cyanoacrylate primer with activator
• Color: Colorless or slightly yellowish
• Application: Polyolefins (PE, PP), PTFE, acetal, elastomers
• Drying time: Instantaneous
• Application method: Brush, spray or dipping method

Applications

• Bonding difficult plastics such as polyethylene, polypropylene, and PTFE
• Surface preparation of acetals and elastomers before bonding
• Production of electronic components and household appliances
• Assembly of components in the automotive and specialized industries
• Applications in transport, construction, manufacturing and industrial assembly

Benefits and properties

✅ Increases adhesion on difficult materials – effective bonding of PE, PP, PTFE and others
✅ Fast drying – accelerates the assembly process and minimizes downtime
✅ Integrated activator – strengthens and accelerates cyanoacrylate adhesive bonding
✅ Easy application – effortless application to surfaces, no special tools needed
✅ Does not negatively affect aesthetics – does not cause discoloration on most finishes
✅ Versatility – performs well in many industries and production environments

Application tips

The primer should be applied evenly to the difficult-to-bond surface, e.g., PE, PP, PTFE plastics or rubber, and then allowed to dry until the solvent evaporates. Once the primer is dry, cyanoacrylate adhesive can be applied immediately and the components joined. For some plastics, it is recommended to test the product beforehand, as an excess may lead to unsightly absorption into the material.