Re: bubbles in side cup
The bubbles coming back up through the paint cup mean it is easier for the air to come back through the nozzle and the paint passage, and into the cup than it is for it to go out the tip of the airbrush like it normally would.
Check to make sure that the nozzle cap is clean and clear of any debris, make sure the nozzle is clean and clear, both inside and out, make sure it is screwed down tight or cleanly seated, if the air can go through the threads or the seat of the nozzle more easily than it can go out through the openings in the nozzle cap, then it blows bubbles. More often than not, the problems are multifold, you will have a dirty nozzle cap and nozzle, the needle cap will be dirty, and for that matter, most of the rest of the brush will probably be in the same state.
Do a good thorough cleaning, and make sure you backflush.
This will help force debris back out of the nozzle cap and nozzle, and into the paint cup, where it can be dumped and rinsed. This should be part of your daily cleaning routine.
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