[MPWR]

+1 what Ray sed.

It soulds like you're spraying the paint much too thick, and it may badly need to be cleaned out now from your earlier attempts.

An airbrush is not as simple as a spraycan- it takes some learning to use it. It is definately worth the effort to learn it- as you have heard, airbrushes are far superior to spraycans. But it's also true that if you start from a base of nearly no experience, you're more likely to get better results from a spraycan.

My advise is first of all to stuff the chamelion paint- at least until you know how to use the airbrush. Get to a hobby shop and get some Tamiya acrylic paint and a bottle of Tamiya acrylic thinner (Tamiya acrylics are very easy to airbrush- flat colors are best). Also get a spray bottle of Windex to use as cleaner. Give yourself an hour or two to play with it and to learn to use it. Having a couple of young boys looking over your shoulder as you do is likely not going to help you.

Use the metal color cup for the paint- not the glass bottle attachment. Pour a little well mixed paint into the paintcup. With an eyedropper, add some thinner, and mix them together. To start, use maybe half the amount of thinner as paint (2 to 1)- the consistency you want is somewhere between whole milk and water. Test spray on a piece of cardboard, and get a feel for the airbrush. You should be spraying at about 20 psi. If the paint is too wet (pools and runs), use less thinner. Not wet enough, add more thinner. Also change the pressure settings and see what that does. Generally less pressure is better, but you need enough to feed and spray the paint.

Give it some time and play with it, and your efforts will be rewarded. If you throw it all together and hope for the best, you will likely be disappointed and frustrated.