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3M Aerospace AC-135 Adhesion Promoter

3M Aerospace AC-135 Adhesion Promoter

Maximize sealant bonding ability while minimizing adhesion time with 3M Aerospace Sealant AC-135 adhesion promoter from SkyGeek. This simple, one-solution formula contains a combination of mixed solvents blended with a high concentration of surface activator agent. It also improves adhesion for polysulfide and polythioether sealants. AC-135 boosts the adhesion of sealants to metal, solvent-resistant, and difficult-to-bond surfaces. It offers a quick and easy gauze or brush application with no mixing and an accelerated sealant adhesion time. This formula is resistant to common aviation industry chemicals and does not soften finishes. AC-135 meets P6140 and AMS3100 qualifications.

Approvals, References and Specifications
  • P6140 - Qualified
  • AMS3100 - Qualified
Use Instructions
Surface Preparation

For maximum adhesion, clean surfaces with appropriate solvent (reclaimed solvents should not be used) to remove dirt, grease and processing oils just prior to application. Use approved cheesecloth, or equivalent, that is free of oil and soap. Always turn cloth frequently to prevent contamination. Always pour solvent on the cloth to avoid contaminating the solvent supply.

Clean only a small area at a time, quickly wiping it dry with another clean cloth. Turn cloth frequently, before the solvent evaporates, to prevent redeposition of oil, wax or other contaminants.

Application Instructions

AC-135 may be applied to solvent-cleaned surfaces with clean gauze or brush. Excess should be wiped off while still wet with clean gauze sponges. The surface should remain a uniform light red color. Dry approximately 30 minutes. Procedure should be repeated if sealant is not applied within 4 hours.


When purchased to the AMS1300 specification, the shelf life of AC-135 is 6 months from date of manufacture, between 40 degrees F and 90 degrees F in the original unopened bottles. Storage at lower temperatures increases shelf life. AC-135 is hygroscopic and will become cloudy due to hydrolysis. This product should be disposed of when it becomes cloudy.

Health and Safety Precautions

AC-135 adhesion promoter is safe to use and apply when recommended precautions are followed. Before using this product, read and understand the Material Safety Data Sheet (MSDS), which provides information on health, physical and environmental hazards, handling precautions and first aid recommendations. An MSDS is available on request. Avoid overexposure. Obtain medical care in case of extreme overexposure.

  • Solvent-based adhesion promoter
  • Simple application and no mixing with this one-component formula
  • Compatible bonding with polysulfide and polythioether sealants
  • Superior performance on metal and solvent resistant coatings
  • Promotes faster first adhesion build rate of sealants to substrate
  • Elevated concentration of surface activator agent combined with mixed solvent blend
  • Reduced time to adhesion
  • Improves sealant ability to adhere to difficult-to-bond surfaces
  • Offers superb resistance to common aircraft industry chemicals including aviation fuels and petroleum products
  • Does not soften finishes
  • No harmful residues
  • Gauze or brush application
  • Color: Pale red
  • Flammable - Flash Point 82 degrees Fahrenheit Setaflash closed cup
P6140 - Qualified
AMS3100 - Qualified

Typical Physical and Application Properties

  • Color: Pale red

  • Flammability: Flammable, Flash Point 82 degrees F Setaflash closed cup

  • Effect on Finishes: Does not soften finishes

  • Solvency: No harmful residues

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    Part Number
    2 oz Bottle
    AMS3100D, Type 2, Class 2
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    Material Safety Data Sheet:
    Code: UN2234 | Class: 3 | Group: III - Click Here for Details
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    Part Number
    Pint Bottle
    AMS3100D, Type 2, Class 2
    Material Safety Data Sheet:
    Code: UN2234 | Class: 3 | Group: III - Click Here for Details
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