The gas tank will be okay as long as you aren't storing it fully pressurized and then under hot conditions. If you vent the gas after you're done it should be okay.
I have noticed a slight flex to mine after having it been pressurized for over a week on propane. I put it in a vice and squeezed it back with no issues and it still holds gas. I will avoid storing gas in there from now on.
In colder conditions, you almost have no choice but to use propane, on duster you don't get very many shots and it's horribly under powered with duster. You may be able to get some better performance using duster if you chilled the gas tank first and warmed the duster can before filling. I haven't tried that yet.
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