yes and no. Flush with CO2 yes but do it from a source like a mig welder or beer tap to keep the dirt out like you would get from a fire extinguisher. Then braze or weld or if you are not after looks there is a 2 part putty called PC7 you can used that and if the metal was clean it will rust out around it before the putty would fail. We used to use that on tool wagons in the junk yard. With the PC7 no need for the CO2 just clean it and dry it very well and make sure good clean bare metal where you want to patch it,put that on wait over night and away you go.
I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!
| 
