when I first got these paints, I got three sets. my thinking was hey pre arranged sets, that's cool. optimized for air brushing, that's cool. easy clean up and I can drop them right into a top feed. I WAS WRONG! the colors are inaccurate. even with FS numbers they got it wrong on every paint in this set. airbrush ready, yeah right. I have tried thinning it, using retarders and just about anything else to get it to flow. when shook it tends to foam and I have found adding a small stainless steel nut as an agitator to be the most effective method to get it to flow. I have since went back to model master enamels and Tamiya paints.