So far so good
Got this to repair a 4 inch crack on my radiator. First I practiced on another piece of nylon plastic until I got the hang of it, then proceeded to do the radiator. Just take it slow and follow the directions. Sometimes you have to let it heat back up after melting a lot so be patient! There's also videos on YouTube. So far it's been holding up at temp/pressure. Preheating with a heat gun definitely helped.
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