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3M™ AC-251 B-2 3.5 Oz - Canopy / Windshield Sealant
MFR Model# 7100133274
Overview
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AC-251 Black Class B are two-part, quick curing, polysulfide based canopy and windshield sealants. These products are formulated for sealing acrylic, glass, and polycarbonate aircraft canopies and windshields. AC-251 Black Class B Sealants contain no solvent and do not craze. The sealants quickly cure and exhibit excellent adhesion and resistance to UV and weather exposure.
6 Oz Container with a 3.5oz Fill |
Features
- AC-251 Black Class B Sealants have a thixotropic, non-sag consistency
- They can be readily applied with a spatula or extrusion gun on vertical surfaces
Specifications
- MAT-587 Qualified (B-1/2,B-2)
Documents
Reviews
This stuff worked great sealing the windshield on my Cessna. Working time is a little less than 2 hours but if you’re properly setup, an hour is more than sufficient. I taped off the area, applied and smoothed the sealant, then peeled off the tape for a perfect finish. It came out great.
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AC Tech Sealant AC-251 B-2 3.5 Fill Black 3M Standard
Verified Purchase
AC Tech Sealant AC-251 B-2 3.5 Fill Black 3M Standard
Verified Purchase
AC Tech Sealant AC-251 B-2 3.5 Fill Black 3M Standard
Great product. You need a special caulking gun to accurately place the very thick solution on the windshield or in any crevasse/gaps. Be sure to properly mix the ingredients
Verified Purchase
AC Tech Sealant AC-251 B-2 3.5 Fill Black 3M Standard
Verified Purchase
AC Tech Sealant AC-251 B-2 3.5 Fill Black 3M Standard
Same results as another reviewer below. We prepped the surface very well and applied the sealant. Let it cure for about 5 days. The sealant strip started to separate from the aircraft during the first flight and just flopped around loose during flight. We very easily removed the remainder of it post flight just by pulling it off. It didnt stick to the surfaces at all.
Worthless on a Cessna. Cleaned and prepped IAW directions and had the entire top windshield strip come off and start beating the aircraft right on takeoff. Wont stick to lexan or aluminum. Save your money and use conventional windshield silicone.
Q&A
Please note, Aircraft Spruce Australia'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 Australia 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.
The material is not considered haz-mat. The surface must be clean and free of any contamination. Primer is not required.
Per the tech data sheet in the Documents tab show the B-2 has a 2 hour working time. Please review the TDS for more details on this product.
That is tough to answer because the size of windshields would vary aircraft to aircraft. Most customers buy 2-3 when installing windows.
They would require a special extrusion gun to apply or you can use the included application tip. The gun part number would be 09-38520 for example.
Yes, this is a 6oz container with a 3.5oz fill.
