Has anyone used a head gasket sealant?

the problem is usually a fix works on a specific type of head gasket leak, if the leak is from coolant to air or coolant to combustion chamber it may seal and sometimes last. but if it goes from coolant into the oil, the crap you pour in gets into the oil, which helps distribute this crap everywhere eventually ruining the engine. Its best to get a head gasket fixed by a mechanic. If it has not ruined the bottom end bearings its usually fixable. If you push it too far by keeping on driving and doing what you want, you end up like my friend larry. I told him park it before it blows up, so he keeps driving and it does blow up that's what happens next.