If he warned you against propane then you probably shouldn't be using green gas as it's the same thing.
Maybe you should be using duster? I'm not actually sure how they hold up with propane but a metal slide and some other minor upgrades should fix that.
It's probably best to also avoid things like Red gas, Black gas, Jet gas, and "Girl Fart" gas (apparently named so because of the "pleasant smell").
ಠ_ಠLess QQ more Pew Pew
READY TO >> RACE