3M™ Ac-350 Class B-2 Aerospace Sealant 3.5 Oz

Part# 09-04009
MFR Model# 7000048211


AC-350 Class B are fast cure, intermediate density polysulfide sealant suitable for fuel tank and fuselage applications. These two-component, manganese dioxide cured sealants are solvent free and have outstanding resistance to aviation gasoline and jet fuel, as well as resistance to chemicals and petroleum products common to the aircraft industry. AC-350 Class B Sealants maintain flexibility and bond strength on most metal substrates such as; aluminum, titanium, steel, stainless steel, glass, and many coatings under extremes of temperature, weathering and stress. The mixed compound is a thixotropic paste easily applied by extrusion, injection gun or spatula, and exhibits superb tooling properties.

3.5oz Fill Premixed Syringe
California Prop 65 Warning Symbol

WARNING: Cancer and Reproductive Harm -


  • AMS-S-8802 B-1/2, B-2, B-4 Qualified
  • AMS 3276 B-1/4, B-1/2, B-2, B-4, B-6, B-12 Qualified


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Way easier and less messy than product from a can. Can easily be pumped into a syringe for precise application. Better nomenclature on cure times would be helpful. I had to google the B codes to figure it out. Maybe a real A&P would know.

Irving W Verified Purchase

AC TECH AC-350 B-2 3.5oz KIT AMS-S-8802

December 21, 2021


Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

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