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Old December 22nd, 2009, 09:40   #5
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Join Date: Jul 2003
Location: Ottawa, Ont.
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Read the fine print on the back, usually found within the warning label, it'll state the product contains either diflouroethane, or tetraflouroethane. Di is weaker than tetra, so go for the tetra which is actually the 134a. You can also use electronics 'freeze spray', is the same stuff, but you'd have to fill your mags right side up to get the liquid in. Difference is in the internal straw, duster doesn't have one so it only spits out the gas when upright, but upside down spits out the liquid. Freeze spray is meant to spit out the liquid while thhe can is held upright, but upside down it spits out only the gas.
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