For a while I wanted to paint a yellow mech. But I know how weak yellow is as a pigment is so I've avoided it for personal projects (where I'd was a lance in the same colour).
I didnt want to put a white or red base coat down as i would be using solvent to weather the paint (since my chipping medium was delayed). I used citadel yellow base as a base and model air yellow to get it to pop
I think in the end its was 4x yellow base and 2/3x yellow to get the pigment down so for that I'm glad this is a one off.
Didn't help that it seems all the new citadel paint pots happen to dry out in under 12months and I need to save it with paint thinner and strain it (not happy about that). Seems GW has designed shelf life now where some paints (bright accents etc) might happily sit for 10+years GW decided to force people to rebuy. The main reason I've been replacing my paints with Vallejo.