When you paint with airbrush colors, do you need to dilute with alcohol the same way you do with gels, or are they good to go without anything?

they are good to go as is. You can dilute down some, if you are looking for pale colors.

Nope, that is the plus of using the airbrush colors. They are already thinned down and ready to go.

I bought some white airbrush color to mix in when the colors are too dark or bright.

Thank you!