Goodson claims its High-Performance Hylomar Gasket Maker and Thread Sealer Maintains seal integrity up to 600˚ F. This polyol-based compound turns from a gel into flexible putty within minutes of application, and its non-hardening formula maintains seal integrity even when subjected to thermal distortion and vibrations. Hylomar is impervious to oil, gasoline, glycol and other engine fluids, and is oxygen-sensor safe. To get yours call (800) 533-8010 or visit www.goodson.com.