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SKU 7100039262
Legacy SKU 62391608601
UPC 00051115313882
Product Number AC79

3M™ Scotch-Weld™ Instant Adhesive Primer AC79 is designed for use on difficult-to-bond low surface energy elastomers, such as EPDM, silicone and other rubbers. Surface preparation and application are straightforward and the adhesive primer is fast drying to keep jobs moving quickly.

  • Improves adhesion on flexible elastomers, including rubbers, such as silicone, fluoroelastomers, EPDM and TPE
  • Fast drying to keep jobs moving quickly
  • Contains cure accelerator
  • Straightforward surface preparation and easy application
  • California compliant
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On it's way to you October 10   


Minimum Order 10 Bottles
Order Increment 10 Bottles
  Immense Durability
  Superior Bond Strength
  Global Shipping
  Industry Low Price
Product Dimensions
Imperial Metric
Weight 0.04 LBS
Shipping Dimensions
Weight 0.52 lb
Length 8.149 in
Width 3.543 in
Height 5.078 in
Color Transparent


  1. What is the 3M™ Scotch-Weld™ Instant Adhesive Primer AC79 used for?

    The 3M™ Scotch-Weld™ Instant Adhesive Primer AC79, Clear, 2 fl oz Bottle, 10/case is designed to improve adhesion of instant adhesives on certain low surface energy plastics and elastomers.

  2. Is it suitable for use on all surfaces?

    This product is specially formulated to work with low surface energy plastic and elastomer parts only. To determine compatibility, always perform tests before using any adhesive.

  3. How much primer should I use per application?

    Only a thin layer of the primer should be applied with a brush or swab in a well-ventilated area. One bottle can prime up to 1,000 square inches depending on part size and porosity.

For industrial/occupational use only. Not for consumer sale or use.
3M industrial and occupational products are intended, labeled, and packaged for sale to trained industrial and occupational customers for workplace use.  Unless specifically stated otherwise on the applicable product packaging or literature, these products are not intended, labeled, or packaged for sale to or use by consumers (e.g., for home, personal, primary or secondary school, recreational/sporting, or other uses not described in the applicable product packaging or literature), and must be selected and used in compliance with applicable health and safety regulations and standards (e.g., U.S. OSHA, ANSI), as well as all product literature, user instructions, warnings, and other limitations, and the user must take any action required under any recall, field action, or other product use notice.  Misuse of 3M industrial and occupational products may result in injury, sickness, death, or property damage.  For help with product selection and use, consult your on-site safety professional, industrial hygienist, or other subject matter expert.
Designed for Difficult-to-Bond, Low Surface Energy Rubbers

3M™ Scotch-Weld™ Instant Adhesive Primer AC79 is specially formulated for low surface energy elastomers that are difficult to bond. To achieve the desired results, this primer should be applied to each low surface energy substrate surface.

Recommended Applications

3M™ Scotch-Weld™ Instant Adhesive Primer AC79 improves the adhesion of cyanoacrylate adhesives to:

  • Difficult-to-bond flexible elastomers
  • EPDM
  • Silicone
  • Fluoroelastomers
Understanding Instant Adhesives

Instant adhesives are fast-acting, cyanoacrylate-based formulas used in industrial and household applications. They are an acrylic resin that rapidly polymerizes in the presence of moisture, forming long, strong chains that join the bonded surfaces together.

To ensure a strong bond, cyanoacrylate adhesives should be applied thinly with pressure put on the bond for a few seconds. 3M instant adhesives apply right from the container and rapidly reach handling strength at room temperature. A single drop per square inch can bond many plastics, rubbers, metals, wood, and more. In 2012, an instant adhesive from 3M set a Guinness World Record for the strongest glue by lifting an 8.1 metric ton forklift in the air for one hour.

Bringing Better Ideas to the Surface through Science and Innovation

In the 3M Industrial Adhesives and Tapes Division, they use the science of adhesion to deliver innovative solutions that improve the design and manufacturing processes of companies worldwide. Their technologies help customers deliver competitive products to the market faster and more efficiently.

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