You need more than one to make it worth your time and money.
Tools needed to recertify propane tanks.
-A selection of expired tanks in good shape. No rust ect.
-A 2 foot pipe wrench.
-A large ratchet strap to hold the tank while removing the valve.
-A can of the brush type gas sealing compound.
-A new valve (optional).
-The dies to stamp a new date. I got mine from princes auto.
-A can of spray on paint stripper.
-A can of spray paint.
-And some time.
"Don't argue with stupid people. They will just drag you down to their level, and beat you up with experience."
Patently waiting for the apocalypses to level the playing field in this physiological game of life commonly known as Civilization