Thought I'd use the Permatex Ultra Grey Gasket Maker product since it's intended for max vibration applications and has a stated 'guaranteed not to leak' disclaimer on the packaging. (Note: I also already have a tube of this in my toolbox.) But I also found this Right Stuff Grey Gasket Maker product. It must have an air-activiated accelerant because it states can be put into use within 1 minute - fully cured!