Brad,
Personally, I wouldn't worry about placing the NFPA markings on your garage. Like Hodgie said, the fire personnel will assume there are hazards in a garage typically associated with a garage. Those hazards being gasoline, paints, gas grill propane tanks, insecticides, pesticides and such.
The lead seals in the acetylene bottles should melt and actually be safer than a one gallon metal gasoline can without any vents. The acetylene bottle will vent whereas the gallon can could essentially BLEVE. One problem with the acetylene is that an errant hose stream from a firefighter could extinguish the flame at the point of the safety valves and then acetylene would then feed into the structure until it finds an ignition point. With the flammable range of acetylene being as wide as it is it will reignite.
If you are home and a fire breaks out, try your best to meet the officer of the first arriving unit and inform him/her of the tanks. That will be one more piece of information for them to use in sizing up the situation and executing an attack on the fire.
John
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 1950 CJ3A. Oddfire 225 V6, T-86 transmission, Dana 18 transfer case, 4 wheel disc brakes, locked front and rear. Manual saginaw steering. Warn winch, 9,000#.
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