Vallejo model air has a very good line of airbrush metallic color. It came pre thin, but I prefer to thin it a bit more with vallejo airbrush thinner. You can find bunch of reviews of those metallic color on YouTube.
Vallejo does clog the needle tip after ~20 seconds(you can tell by the outflow decreasing), but it is easy to clean with a q-tip + alcohol on the tip. May be this will fix your clogging problem, unless the clog happens on other places.
Another way to avoid clogging, if your airbrush is dual action, release the paint first then the air, so the air will shoot out the residue paint in the needle. Do the same when you start airbrushing, pull down for air first, then press down for color.
I usually thin my own paint in the airbrush, then back flow to mix the paint. Or use those tiny disposable measurement cup for medicine.
If you don't mind lacquer paint, there are also Allclad II, just get a mask so you don't get brain damage.
What kind of paint are you using?
This is all good information. I swear by the Vallejo Air line. If you want to save some money though you don't even need to use their airbrush thinner. I use target brand Windex. It works great. I don't thin their Air line but do their standard Model Color line. With Vallejo I've found you'll get the best results running about 25 psi. What is your airbrush setup? You want your paint to be about the consistency of skim milk.
I don't have issues with thinning paint other than metallics. Metallics have to be thinned much more than regular paint in my experience.
I use iwata cleaner for no odor and I use 91% alcohol to clean and thin as well.
I use local acrylic brands and I mix my own blend of paints to make the most of the money I spend. My Eva and Gunpla, everything from the gunmetal, metallic pink, white, etc. are all blends and mixes I make to account for the lighter color due to thinning.
I strictly use acrylic paints and acrylic primer. I mix my own primer blend as well with white primer to make my own pink, grey, black primer. I keep Tamiya Light Grey on the side for when I need a different finish or a quick job.
I need to get jars or some paint container to hold my blends because I always make a little too much.
Airbrush is gravity cup not siphon.
I guess I should just thin my paint down a little more. I'm afraid of thinning too much. I need to avoid clogging and occasional sputtering. I hate it when I have a nice clean paint job and it gets ruined with a stray speck.
Has anyone built this and or painted it? I'm interested in Jehuty HD as my next plamo after I finish my line of Gunpla.
How is the build? Is it strong? Is it flexible? Compared to Gunpla?