I don't have CO2 but just curious and want to learn for future reference, especially because my LFS sells CO2. I currently have two 20oz. paintball tanks for CO2, and one paintball tank for compressed air. The compressed air is a big tank, 91ci @ 3000psi. and is fiber wrapped. Only one of the three still in hydro, which is one of the CO2 tanks 
Can you put CO2 in an air tank, and I wonder if they are strict on the hydro dates?
Can you put CO2 in an air tank, and I wonder if they are strict on the hydro dates?
