I have used it several times with excellent results. I founf a missing main cap that was buried in the soil when scrounging up a '67 327 block in Kingman, Az. My friend had torn apart the motor, outside, and then left it to the elements . The cap had been buried at least 5 years and it came out like it was brand new! I was at the SEMA show a few years ago and I visited their booth. It sounded like lots of hype at the time but the stuff does everything they say and more. I would recommend it to anyone.