Nope, don't heat nothing. 2 or3 steady quick passes and done. It ain't on there long enough to hit nothing. I am guessing you are either guessing and assuming it heats & take the temper out, or made the mistake personally. I haven't had that problem, and it last damn near as long as a new chain. There is more than one way for things to be done. Just because folks find a faster, easier way, doesn't make it a worse way. Have a nice day.