Yes it is a gravity feed..no I have not took it apart..the needle chuck is tight..what do you mean by they might have not made a good seal?? As in the seal in the bottle??..would I be better off just spending a lil more money on a better name brand airbrush or just keep trouble shooting?
Hi DK, cheap airbrushes are usually cheap for a reason, but we still need a lot more info over the problem, for example, if you put your hand in front of it can you feel air coming out of it? and if you put paint or water in it are there bubbles in the paint cup, everything happening on, in and around your airbrush is relevant to any problem that may arise.
If you actually know the name or make of your airbrush you can usually find a schematic for it on-line, I would suggest you check out Mitch's video on stripping and tuning an airbrush and try to become familiar with all the parts ans what they actually do, very important is that all seals do seal and and all small parts properly seated, it is also very important understand what can happen when one or checks have been missed or done wrong, including cleaning, you should always clean and lubricate a new airbrush before it's first use, a lot of airbrushes may contain deposits from the factory such as grease or oil used in machining or even minute metal shavings.
You should have magnifying glass at hand to check small parts periodically.
A lot of questions are being asked time and time again, and although we are here to willingly help, there is a mine of information in the archives over this and almost every other problem related to airbrushes.
I also have cheap airbrushes but I also have 40 years experience spraying normal spray guns which are generally larger versions of an airbrush, therefore i have no problem being able to tune them so that I can get the best out of them, I have been using four cheap brushes for almost one and a half years with no problems, or at least none that I don't how to fix, the most expensive airbrush in the world will now help if there is someone behind it who doesn't fully understand it and even it would break in the wrong hands, basically a good airbrush does not make a good airbrusher.