I've used Parma Faskolor and Pactra RC finish for years on polycarbonate bodies. Both have advantages and disadvantages. Pactra is solvent based - it will spray at a lower pressure when suitably thinned and out of the 2, is probably the easiest to get along with but I no longer use it becasue its solvent based and it's not great for my asthma - even though I wear a mask. Parma Faskolor can be sprayed without thinning but you need alot of air pressure and for the air temp to be slightly warm but I've found that by thinning it (I use the Fasthinner), I can spray much more easily at 25-30psi (like Pactra) which is well within my compressor's capabilities. It's also water based - so doesn't smell and is kinder to my lungs - although I still try not to ingest it. I've never tried Createx but there's a host of different water based paints that are very similar and all compatible with Polycarbonate. Just remember to spray the darker colours first and work in reverse to whatyou'd normally do.
The key is in surface prep (key the surface - especially when using water based as they don't attack the plastic like a solvent paint) and in getting a good consistency by thinning. Too thick or too much air pressure, or too thin or too little and you'll end up battling to get a good finish. I tend to thin to begin with at 2:1 (Thiners:Paint) and mess around on scrap lexan or paper until I get a good flow. No different really to using Tamiya Acrylics on a hard body but I've yet to find a paint that sprays as nice as the Tamiya ones so be prepared to adjust your style a little bit. HTH Andy.