Does head gasket seal work
Not all the time,and would only use it at last resort.
As TST said. But I can tell you this. There's a product called Blue Devil that does work BUT you have to follow the instructions on the bottle to the exact letter. We have a couple of shops that buy it from us (I work for NAPA) occasionally. They offer it to their cousomers sometimes when they know a head gasket job just isn't in the person's budget. It's good stuff. It's also the ONLY stop leak product I'd recommend because I know that it works without any I'll effects such as clogging up heater cores, cooling system passages, or radiators. HTH. -Jim
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