I have seen similar stuff work on some engines, fixed the leak and cars drove for a long time after, but on the other hand other cars had the problem come back and one even got coolantpassages get blocked up.
The used car salespeople use this stuff, and i wouldnt do it on my own car if i was going to drive it for a long time. Getting stranded at the side of the road sucks badly, especialy if you are in a sportscar.
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