3M 7100039264 Instant Adhesive Primer AC79 8 Fl Oz

Product Description

The 3M 7100039264 is the Scotch-Weld Instant Adhesive Primer AC79, a colorless surface preparation primer formulated for use with instant adhesives on difficult-to-bond elastomeric substrates. AC79 is a California-compliant formula, making it suitable for job sites and shops that must meet VOC regulations. The primer is applied to each elastomeric surface before bonding, activating adhesion where standard cyanoacrylate adhesives would otherwise fail to grip. It is used by maintenance technicians, industrial assemblers, and trade professionals working with rubber and elastomeric sealing components in HVAC, plumbing, and mechanical systems.

AC79 is designed specifically for elastomeric surfaces including silicone, EPDM, and other rubber-based materials that resist conventional bonding methods. Typical applications include sealing gasket repairs, elastomeric joint preparation, and pre-bond treatment on rubber components found in mechanical, HVAC, and plumbing assemblies. The primer primes each substrate surface individually before the instant adhesive is applied, improving adhesion on materials that are otherwise chemically incompatible with standard cyanoacrylate chemistry.

Key Features

• California-compliant VOC formula suitable for regulated job sites
• Formulated for difficult-to-bond elastomers including silicone and EPDM
• Colorless finish leaves no visible residue on bonded surfaces
• Apply to each substrate surface individually before using instant adhesive
• 8 fl oz container sized for shop and field use

Compatibility

Designed for use with instant adhesives on elastomeric substrates including silicone, EPDM, and similar rubber-based materials. Apply primer to each elastomeric surface prior to bonding.

Installation Notes

Apply AC79 primer to each elastomeric substrate surface and allow it to dry before applying the instant adhesive. Ensure the work area is adequately ventilated when using solvent-based primers. Wear appropriate chemical-resistant gloves and eye protection per standard shop safety practice. Do not apply the instant adhesive until the primer has fully dried on all mating surfaces.

Technical Specifications

• Color: Colorless
• Volume: 8 fl oz
• Weight: 0.52 pounds
• Unit of Measure: Each
• UPC: 00051115313899

Standard Information

• Brand: 3M
• Manufacturer Part Number: 7100039264