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SKU 7000000907
Legacy SKU 62390135259
UPC 00021200210877
Product Number 3901

3M™ Scotch-Weld™ Metal Primer 3901 is a primer designed for applications using 3M™ Scotch-Weld™ Structural Adhesives. This film and liquid adhesive primer is able to improve metal and glass adhesion. Additional features of this primer include improved corrosion protection and resistance to environmental exposure for metal.

  • Improves glass and metal adhesion and resistance to environmental exposure for epoxy and urethane structural adhesives
  • Offers improved corrosion protection to metal for long-lasting performance
  • Protects cleaned surfaces until bonding operations can be completed
  • Ensures complete wetting of film adhesive to adhered surfaces
  • Easy application and quick drying
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On it's way to you October 6   


Minimum Order 12 Canisters
Order Increment 12 Canisters
  Immense Durability
  Superior Bond Strength
  Global Shipping
  Industry Low Price
Product Dimensions
Imperial Metric
Weight 0.487 LBS
Shipping Dimensions
Weight 6.441 lb
Length 10.9 in
Width 8.3 in
Height 6.2 in


  1. What is 3M™ Scotch-Weld™ Metal Primer 3901?

    3M™ Scotch-Weld™ Metal Primer 3901 is a red, high-quality primer that's specially formulated to enhance the bonding performance of adhesives on metal surfaces. This fast-drying primer offers corrosion resistance and promotes adhesion even on smooth or painted surfaces.

  2. How do I apply 3M™ Scotch-Weld™ Metal Primer 3901?

    For best results, you'll want to make sure the surface is clean, dry and free from any oil or grease before applying the primer with a brush or spray gun. Let it dry for at least five minutes before continuing with your adhesive application.

  3. Is this product available in different sizes or quantities?

    Yes! Currently this product comes in a pint-sized can; however, there are cases available that contain twelve such cans for bulk purchases aimed at industrial applications.

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.
Improves Glass and Metal Adhesion and Resistance

3M™ Scotch-Weld™ Metal Primer 3901 is a one-component, metal and glass primer designed for applications using 3M™ Scotch-Weld™ film and liquid structural adhesives. This product is specially formulated to enhance metal and glass adhesion, making it easier to bond surfaces. It also protects cleaned surfaces until bonding operations can be completed, simplifying production scheduling. Additionally, it offers resistance to environmental exposure and improved corrosion protection to metal. The low viscosity of 3M™ Scotch-Weld™ Metal Primer 3901 ensures ease-of-application and 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

3M™ Scotch-Weld™ Metal Primer 3901 is ideal for applications using 3M™ Scotch-Weld™ Structural Adhesives. It 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.

What are Epoxy Adhesives?

Epoxy adhesives are a type of structural adhesive that includes polyurethane, acrylic, cyanoacrylate, and others. They are formulated as liquid reactive polymers that undergo a chemical reaction when mixed and then cure to form a solid plastic material. Once the two parts are mixed in their specified ratio, they begin the curing process and offer a limited work life (open time) where the adhesive can be applied and the two surfaces positioned as needed. These structural adhesives provide high shear and peel strengths, depending on the formula, and better heat and chemical resistance than other common adhesives. Epoxy adhesives have the highest overall strength and offer the best performance and most resistance to high temperatures, solvents, and outdoor weathering.

Epoxy adhesives are widely used in building and home construction, aircraft and automobile manufacturing, bicycle, boat, golf clubs, ski and snowboard assembly, as well as a host of home use and other applications. They are used virtually anywhere high-strength bonds are needed along with resistance to environmental conditions. These adhesives are popular for their ease of use, mechanical strength, and chemical resistance. Formulations can be created to make epoxies flexible or rigid, transparent or opaque, quick setting or slow setting. The versatility with which epoxy adhesives can be formulated helps meet almost any requirement for bonding wood, metal, glass, stone, and various plastics.

Industrial uses for epoxies range widely and, in addition to adhesives, include coatings and composite materials like carbon fiber and glass-reinforced composites. They are the preferred choice due to their ability to flow and conform to the work area, strong adhesion, chemical and heat resistance, and exceptional mechanical and electrical insulating properties.

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