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Hmm, interesting! I wonder what happens when and if you ever pull the heads off? Can this stuff be removed? Will the head be permanently adhered to the block? Once drawn into the cylinder through the head gasket leak, will it attach itself to the piston, valve, or cylinder walls? Since it bonds in high temperature conditions, will it bond to the block inside the water jackets that surround the cylinders? Lots of unanswered questions here.
Why would any of the 'thousands of mechanics' mentioned use something that is just going to take work away from them (ie., pulling a head manually and repairing it thoroughly and correctly), unless of course they charge the same for 'installing' it (pouring it into the radiator.) It would be the easiest head-removal job they ever did.... yeah right.
Head gasket replacements are low profit jobs. They would rather put their time towards high profit jobs like coolant flushes, front end parts, exhaust, and brake jobs. That's why.
this question has been asked numerous times on my legend forum and the same product in question. dont use this and yes its a pia when you do eventually go to get it fixed. the crap is everywhere and hard to get it all out. there is one brand that some have used and spoke well about, but the general thoughts dont use it any of the fixes, get it fixed. i have to go back and look for the name but i think its blue devil or something like that.
From reading about sealers it appears that they are for use on engines you would never do a gasket replacement on because of the cost.
If your truck/car is worth less than the repair, and you would junk it anyway, I would say go for it, you have nothing to lose.
This also addresses the problem of repair difficulty as you would not be repairing it later.