i read a post somewhere either here or someplace else that you could use a 20 gallon air tank and regulator to use your airbrush instead of testors propellant cans or a compressor. it also said it would last longer than the propellant cans. well i was all happy and when i had the money to do so (recently) i spent 40 bucks for the tank and regulator. well i pumped up the tank to 100 psi and it did not even last half as long as a testors can. did i do something wrong ???? my output was 40psi my airbrush does not perform well with most paint below that. i ran it for only like 15 mins and it was tapped out more or less.