Very interesting I need to try that. I guess it goes without saying that you would not do this if you have an FRL on your compressor as you would not want to contaminate your work surface.One tip I have for anybody is mig gun in one hand air blow gun in the other. Make your circle for your spot weld and as soon as the cherry is gone I blow air on it, cleans any light scale and cools metal all the way back down so you don't start to collect heat even keeping your spots separated. That's all I've got.
Great Tip!