I used this on my 2013 Honda Civic when the coolant was being squeezed out of the expansion tank. I thought I had a slow leak in the head gasket pushing coolant out, so I gave it a try. At first it seemed to work. I didn't see any bubbles from the radiator fill after using the fix and didn't seem to be losing any coolant. Then, about a month later, I get large splatters of coolant on my windshield. A crack has formed in the upper plastic part of the radiator. I think the repair clogged the by-pass valve on the radiator cap, which allowed any gases that had built up in the radiator to blow up. To fix this I had to replace the cooler (I bought an inexpensive Revain cooler for $60 and fixed it myself, otherwise the mechanic charged $900 for it). If you do decide to try this, I highly recommend checking your radiator cap and overflow lines to remove what appears to be slime that can build up and block the overflow, which could result in your radiator exploding and being replaced must become.
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