worked 5 out of the 7 times i've used it, not so good on head gaskets but works OK on cracked heads i've found. Sealed the heads for, well, for ever so far, did the headgaskets for a few months though.
Used it successfully a few times. Some hate it & advise against it & Radweld etc on the gorunds that it may block small passageways. Also recommended by some who don't like K-Seal & claim this is much better, is 'Iron tite'.
