anybody ever use freeze-off made by CRC ? does it work ? who sells it ? the bolts holding my exhaust manifolds are pretty cantankerous. i don't want to use the heat wrench as it is rather cozy in there. pulling the engine isn't going to happen until i replace it. my thought was to run the motor for 15-20 min and then spray the bolt heads with freeze-off but i would like to know beforehand how effective the stuff is. 
