Originally Posted by kane

Years ago I had a car that had this problem. I used one of those sealer products and for a few months it seemed to work pretty good. Eventually, however, the head gasket blew out completely, the car overheated and cracked the head.

I'm no mechanic, but just based on my experience and what I have been told, those things can work for a very short term, temp fix, but likely won't work as a long term solution.