Most of PCP tanks are made from stainless steel, yet they are blued/blackened. I heard it's impossible to blacken/blue the stainless steel? Is there a way to do such thing at home?
3000 PSI Tanks are usually aluminum and powder coated
I drill holes in 2 or 3 weekly when they have reached there rehydro date. (own a paintball pro shop and 5 playing fields plus a small gun shop)