I'll add one more hint on the CO2 or N2 bottle.
The bottle and regulator costs are the same for Ar as for N2. If you get argon, the refill price differential for an 80cfm bottle is only about $10 (30 vs 20). With the Ar you can weld aluminum with your wire feed welder (good excuse to buy one if you don't already have one) and you can also drill a hole in the side of old nitrogen filled insulated glass and blow in argon to clear up fogging and increase R value (seal holes with butyl afterwards)
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