Used it a few times, works permanently on some, the garage I first got mine from had used it to seal up cracked heads(waterways) on a diesel engine 6 years and counting still no leak, it defo does NOT cause any clogging of waterways either, will work within a few miles or not at all.
Used it on my cossie with seriously blown out water way on hg, bought me a few thousand miles each time, till I had time to fix properly.
tabetha