Home › Forum › Ask A Member › Firestone Crankcase sealer › Re: Firestone Crankcase sealer
That should be just fine, as should a material like Yamabond 4 (and its Three-Bond equivalent) or the Permatex Ultra Grey. The Yamaha / Three-Bond is the same type of sealant used by all of the Japanese motorcycle manufacturers to seal gasket-less engine cases. The Ultra Grey is an RTV material that’s spec’d by many current auto manufactures for similar applications, though it’s also used along with gaskets (such as on a valve cover).
My experience with the Permatex Aviation sealant, is that it tends to be a little on the thin side, and also sets up a bit more firm than the description might suggest. That is, it behaves more like a glue than I’d like.. but it should still be OK for anything you don’t plan to pull apart anytime soon.
(Your experience may vary)