"Duster" is currently Difluoroethane; it use to be Tetrafluoroethane (HFC 134a).
"Blue gas" was bottled HFC-134a with lubricants, similar to "Green Gas" being propane + silicone.
HFC22 (HCFC-22, Chlorodifluoromethane) was "Red Gas" and pre-dates propane and has slightly higher pressure. This hasn't been around for a decade+.
"TOP Gas" is generally associated to Green Gas but it was actually something else with similar pressure/performance ("HFC-122" -- whatever that's supposed to be). And just to add to the confusion, there was (still is?) a company called TOP which sold green gas.
So all in all, you're fine with propane.
Last edited by Drake; January 21st, 2014 at 17:41..