I'm no expert on why some airbrushes are so expensive and others can be had for a little over £10 - but I do believe the seals are fundamentally different - and when they fail - the whole thing just stops working.
I've tried various cheap ones from various eBay sellers and still use them - just to have one filled with white or black for backing etc.
But - I've had various problems with them from no paint spraying at all - to some crazy back pressure - where air blows back up through the paint - to just quickly degrading performance.
One died within a few days - it was £20 so I returned it and had it exchanged - only for that one to die too!!!
It's a gamble with the cheap stuff.
What I found with the expensive Iwata - was the consistency is just great - and it works beautifully with very low pressure - whereas the cheap stuff needs more air to move the paint.
The Neo needed my compressor cranked right up just to spray - even then hardly any pressure came from the air airbrush - it was like there was something fundamentally wrong with it - just hopeless!!
I now use the Iwata and I still have a brush that John Miller used to sell for around £100- that too has proved totally faultless.
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