[roadkillbobb]

are they the heavy steel ones or the ones of the thinner metal disposable ones that you buy to fill balloons?

 

[roadkillbobb]

the only problem would be how do you drain the water out of them unless you mount them upside down, build a bracket on the wall and make a manifold out of black pipe to connect them with a drain on it..

 

[roadkillbobb]

the only problem with using tanks for compressors that werent made to be used is they can go BOOM and kill you.....old propane tanks make great bbqs, but unless you get it hydro tested I would stay away...what kind of compressor do you have?..the helium tanks wouldnt add that much volume for all the work...mabe just easier to buy a new compressor or buy a compressor with a blown motor or pump but the tank is still in good condition...