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I have need of the Citadel can proppellant for the spray gun but GW seems to have trouble to send me the one I ordered. Is there something else i can find on the market to replace the propellant?

A compressor? There's one in this link for about $69. Little elephant shaped one
http://www.tcpglobal.com/airbrushdepot/compress.aspx

If you are using the GW spray gun, I'm not sure if they have a special fitting only to be used with their cans, but testors makes propellant also.

If you find many uses for the airbrush I would pick up a cheap compressor. It will pay for itself.

The GW spraygun uses the same fitting common to both the testors starter and the badger starter.
The cans are the same, too - only GW charge more for theirs.