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(HAO) Hylomar Sealant, 100g (3 oz) Tube, medium consistency

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Brand: Hylomar

Genuine Hylomar is perfect for sealing Hewland bearing carriers and rear covers, or any other parts that need to be disassembled easily and without a lot of scraping to clean up the residue. It is not recommended for semi-permanent assemblies such as Hewland sideplates. Seals gaps up to .010 inch and since it never hardens, it makes disassembly a snap. It cleans up easily with acetone, even after use. Hylomar also makes an excellent gasket dressing.

Hylomar is not affected by oil, gasoline, or glycol. It is oxygen-sensor safe and will not cause corrosion of any metal surface. Withstands operating temperatures up to 600° F. Supplied in 100 gram (3 ounce) tubes as a medium consistency paste. We also offer Solvent-Free Hylomar Advanced Formulation (AF) Liquid Sealant in 8 ounce brush-in-cap cans (Part No. 3318).

We also stock Wellseal (Part No. 3304), a similar sealant preferred by some engine builders.

Note: (HAO) = Hazardous, Air only. This item is considered Hazardous by UPS when shipped by air (3 Day Select, 2nd Day Air, or Next Day Air). A hazardous shipping charge of $46.50 will apply if shipped by air. The estimated shipping cost shown on the Shopping Cart page already includes this charge if applicable. This item cannot be sent via US Mail. Due to shipping restrictions, we are not able to ship this product outside the USA.

Part No.
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Condition: New

In Stock

An essential product


If you run an older gearbox don't even think about using an alternative product.


Austin Texas


Hylomar still the best


I've been using Hylomar on Hewland gearboxes since 1971. Easy on and off of parts. Every time I've tried the latest silicone or similar product, I end up coming back to Hylomar. Pegasus is about the only supplier to carry it in the US.


Monterey, CA




Using Hylomar gives me the confidence that I've used the right stuff on my Hewland Gearbox covers.


Virginia Beach, VA


(HAO) Hylomar Sealant, 100g (3 oz) Tube, medium consistency

4.7 3