Welding Tips and Tricks

I was watching this video:

http://www.weldingtipsandtricks.com/broken-tap.html

and I was sort of intrigued about the candle wax. How does that work?

If you have a tap jammed in there, how does the wax flow into the threads? Then, how do you stop it from contaminating the weld so that your mushroomed head doesn't just snap off?

He actually explains it in the video. He mentions that the wax addition (after the weld build-up is done, but while the parts are still very hot) works because it does not evaporate like most oils, due to the high flash point of liquid wax but rather it stays liquid long enough for it to work itself down into the threaded area. So you don't actually smear solid wax all over the place and then take the torch to it. Might want to watch that video a couple more times and listen to what he says to put it all together (which is what I summarized).

I've used it in the past to get broken studs out of engine blocks. It's an excellent trick and does work as advertised.

I just want to know if " woodpecker lips" are harder than a ministers dikk