It won't do anything if it gets in an oil passage. It's an aerosole, it doesn't clump, and it obviously doesn't stick to anything that isn't oil free. Research it a bit before ruling it out. It's far safer than RTV and in my experience works 100% of the time versus RTV allowing the gasket to slip out. When RTV squishes it's in a clump, if you can see it squished outside the tappet cover then it's obviously inside as well. If that comes off inside your motor then you have a clump of RTV floating around your motor potentially causing the problems you just listed. High Tack can't do that. Just throwing that out there. It's a staple for engine builders that have to worry about a completely and confidently leak free motor.