Anyone used a Aztec A470?

[gainsy]

Hi
I am new to air bushing so a friend has lent me a Aztec A470 airbrush to practice with
I am using Faskolor acrylic paint
So far i have had no luck with it really, paint seems to come out when it feels like it, this stuff say's it's ready to spray so tried that & nothing came out, so watered down a tiny bit, got a little coming out, watered down some more, no change really, watered down loads & nothing came out
It sprays water through the bottle no probs
Took it all apart & soaked it all last night so hopefully i will get better results today
Anyone got any good advice on the brush?
Got no idea what needle size is in it as it doesn't say nothing on it
Have been practising on some spare lexan i had but don't fancy trying my new shell until this thing is working properly
Or should i just send it to Jon for a pro job
Cheers
Gainsy