I have had reasonablly good luck with this rod. BTW, you can get it at Harbor Freight, 10 rods for $10. Heat is not a problem, vibration is. You need to have a strong mechanical joint to withstand the shaking. I find MAPP gas works best. I am able to repair glo fuel engine mufflers, but use it mostly for gas mufflers. I have found it's not necessary to use a stainless brush, just a wire wheel does it for me. This a good product if used within it's limitations. Once again you need a good, clean mechanical joint (overlaps and pop riveted or screwed) for it to take the vibration. Can't be beat for filling holes. Try to make the joint pretty enough so that you don't have to grind it. Hope this helps and good luck, red