I was watching modeling channel on you tube ( TREK WORKS ) and saw a guy using cheap waterbased craft paints on plastic models with an AIRBRUSH . He thinned it with water and ran it through an automotive paint strainer and it worked well. I just tried this on aHO caboose. I used the very cheap Walmart red thinned with a mix of water/ Windex used a strainer and came out good after some time shot some micro-scale semigloss . After a day added some water slide decals then a dull coat and it all worked fine. I will be using this more in the future. This is not a replacement for RR colors paints but for custom colors is nice. Just wanted to share.