Now days milk cans are mainly decorative compared to the important part they once played.  The milk cans are chemically stripped to remove all rust and grime; please do NOT sandblast the cans first.  Then the milk can is submerged in molten grade “A” tin to restore your milk can to its original condition.  If you choose to use the milk can to hold fluids, it is soldered to repair any holes and the seams are soldered to prevent leaking.