Hylomar is a polyester polyol-based compound that turns from a gel into flexible putty within minutes of application. Originally developed by Rolls Royce, where it performed under the most stringent aerospace tolerances, Hylomar brings superior qualities to automotive applications. Its non-hardening formula maintains seal integrity even when subjected to thermal distortion and vibration.
J**.
Expensive but worth it.
I bought this to use on some MLS head gaskets. It fills in tiny imperfections and allows the gaskets to truly seal to the block. After assembly, I had the compression checked and there was no leaks at all. No coolant in the oil or oil in the coolant. For the small price of a can, it is worth the assurance of a total seal of the head gaskets.
Trustpilot
1 day ago
2 months ago
