Molded color finishes are achieved by spraying only a matte or other clear coat without painting, but I think they often have the impression that they are for people who don't own an airbrush.
However, if you plan to enjoy model making for a long time, I recommend purchasing an airbrush if you are going to spray clear coats, even if you are only going to use a molded color finish.
One reason is cost-effectiveness. Once you buy an airbrush, you only need to buy cheap bottles of clear paint after that! It's a great deal in the long run.
The second reason is the beauty of the finish. A delicate airbrush produces a much cleaner finish than a spray that sprays powerfully over a wide area.

Recommendations for molding color finishes - it's best to wait for the airbrush | どんぶり's Gunpla works