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Yellow, red, and white are notoriously weak colors - orange can also be, especially the brighter types. Some brands have somewhat stronger or weaker versions of those colors, but it's a general problem with the pigmentation that stretches across brands.
Expect to need to apply numerous thinned coats (or use an airbrush) to get strong, even coloration. Basing in a darker, stronger version of the color can help, as mentioned.
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