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3.5 oz Fill Quart
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6 oz cartridge (Fill: 3.5 oz. sealant) or Quart size available

CS3204 is a fuel resistant sealant for use on integral fuel tanks and pressurized cabins as well as other areas subject to contact with aircraft fuels, lubricants, oils, water and/or weathering.

At room temperature, this two-part polysulfide cures to a flexible, resilient rubber.

Meets requirements of specifications AMS-S-8802 formerly MIL-S-8802, CMNP021, Lockheed, Gulfstream, Hughes Aircraft, Fairchild SPS 6-1 & 6-2

Technical Data: Class B*
Cure Profile B-¼ B-½  B-1 B-2 B-4
Application Life (hrs) ¼  ½  2 4
Tack Free Time (hrs)  6 8 15 24 36
Cure Time (hrs) 16 30 40 72 90


In all fairness, I cannot rate this product since I have not used it as of this time. However, I am certain that it will meet or exceed my expectations. Presently, I am attempting to find a brass end cap fitting 3/8 inch with tapered NPT. Once I have found the fitting and sealed my fuel tank I will be able to use the sealant.

Lowell C
November 12, 2019

I used this to seal a crank case bolt on the top of the engine which was leaking oil. Works great. Smells like Proseal and is just as messy but a great product.

Thane O
April 29, 2019

We used this to seal the crankshaft plug on my Piper Cherokee. A little goes a long way. Just make sure you mix it properly and you will not have any issues. Cheaper than Proseal and works just as well! Great Product.

Nicholas S
March 2, 2018

First time I’ve used this product . Worked as advertised. Very messy stuff if you not prepared .

April 1, 2019

Good product. Mixes well. Could use a better method of getting the product out of the applicator

Webbco L
November 30, 2017


Q: Does the quart size of this Chemseal sealant come in a can?

Yes, the quart size is in a can.

Q: What is the shelf life of Chemseal CS3204B1/2?

The storage life of CS 3204 is nine months when stored in the original unopened containers at temperatures below 80f.

Q: Where can I find the Safety Data Sheet (SDS) for this Chemseal B 1/2 sealant product?

We have added the MSDS PDF to the Documents section of this web page. Please review it there.

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