Like those guys said.
If your using createx it also helps to flush clean with water after each color change. If it's gravity feed pour water in the top till it runs clean,if it's siphon buy a clean blast cap and let it suck up from a cup of water. In both cases turn it upside down at the end till all the water is blown out and nothin but air is blowin out.
You might find you need to thin down the paint more in this hot waether.