I don't know what the rules are there but here in Memphis, and surrounding areas, gas cylinders are color coded to represent its contents and welding supply stores will not (can not) refill or take in on exchange one that has been painted a different color than is coded for the gas.
Regardless...
I believe the inside of soda or beer cans are prayed with something to keep the aluminum taste out of the liquid. You may have to sand and primer the surface.
It wouldn't quote so I copied and pasted. Originally written by RCStocker.
"Sense I have a degree in architecture and have had engineering classes I will put it this way. You would need one huge machine to do any damage."
"Since" not "sense" degree man. And I'm pretty sure this was a "what...