I bought a relatively cheap compressor etc from machine Mart, along with air hose extension, fittings, two guns. I only have experience with Cellulose paint - twin pack is excellent, but the fumes are lethal, so specialist breathing gear will also be needed. Dilution is 40-50% thinners (depending on temp), and 45-60psi depending on spray pattern etc.
Landmann is right - prep is everything. If you are spraying a panel that already has a layer of paint on it, then there would be many layers - etch prime, a couple of layers of hi-build primer, then as many as 5 top coats - 2 of which are likely to be polished back off again once the paint has cured.
Example of a new wing:-
It came with a yellow coating that I was told is etch prime, buut in fact it's just a layer of anti-oxidant.
As it comes - anti-oxidant has runs in it, so a light sanding with 100 wet dry everywhere to flatten out and to provide a key for good adhesion.

One coat of etch primer (don't rub it down - if you go through it to bare metal, you need to re-coat with etch prime again)
Then two coats of grey hi-build primer. A handy tip if you are painting something that's an awkward shape and want to make sure you put the required number of coats on is to use two different colours of primer (grey and red) that way, any misses will be evident.

Once dry (most primers dry very fast), check and flatten out with 1000 or 1200 wet/dry paper using water with a small amount of washing-up liquid in. Rinse with fresh water and once dry, several layers of top coat, allowing sufficient time between to let the last coat dry.

I then left the panels to dry overnight and assembled the two parts that make the wing.
A small amount of T-cut to flatten out the paint, then polish. If you have done it right, then you can get get a surprisingly good finish.




Les.