Part# 09-04494
MFR Model# 0890B1/2AM655SK


P/S Class B is an aircraft integral fuel tank sealant. It as service temperature range from 65F (-54C) to 250F (121C), with intermittent excursions up to 275F (135C). This material is designed for fillet sealing of fuel tanks and other aircraft fuselage sealing applications. The cured sealant maintains excellent elastomeric properties after prolonged exposure to both jet fuel and aviation gas.

P/S 890 Class B is a two-part, manganese dioxide cured polysulfide compound. The uncured material is a low sag, thixotropic paste suitable for application by extrusion gun or spatula. It cures at room temperature to form a resilient sealant having excellent adhesion to common aircraft substrates.

The following tests are in accordance with AMS-S-8802 Class B specification test methods.
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No issues with purchasing, shipping or the product. The sealant was fresh and well within expiration date. Always a pleasure buying from /aircraft Spruce!

Jeff E
May 5, 2021

You did a great job keeping my backorders moving. Thx! BP

Bob P
May 3, 2021

Works great, sealed the fuel leak

April 12, 2018

Very fast Delivery. The kit arrived without any instructions on how to manually mix and apply. I found instructions online (SEM kit). The kit is a uses the injection method and is easy to mix. Get the nozzle kit. Apply product with a caulk gun. It helps with precision of the application and is less messy. The 1/2 hour product sets quickly. Dont waste time from mixing to application. Give it a day to be certain that the product has cured So far, so good. no leaks recommend

Daniel C
July 11, 2019

The instructions for use as printed on the plastic packaging is very small and eligible to some degree--difficult to work with!!

Tim T
February 7, 2020


Please note,'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. 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.

Q: Does the pro seal plunger come with both parts of the compound? Is mixing still requried or does the plunger mix it for the user? Does the entire amount need to be used all at once? Can it be purchased in longer set up times?

Yes, this comes with both parts of the compound. Mixing is required, it will explain it on the instructions that come with the product. Yes, you would have to use the entire amount all at once. You can purchase it in longer working times referring to product P/N# 09-38510. This part will meet the same specs.

Q: What is the cure time?

7 hours at 77 degrees per the tech data sheet.

Q: Does Pro-Seal PS 890 B work on plastic tanks?

Yes this will work with plastic.

Q: Will this fit in a standard sized calk gun? If not, what size do I need?

It will not, you would use our part number 09-38520.