Hi Chris,
A search under “AK Weathering Pencils” produces several discussions on the topic.
https://forums.kitmaker.net/t/ak-interactives-weathering-pencils-buy-or-not-to-buy/17342/27
It works if the painted surface is rough and matt. It doesn’t work if the painted surface is smooth and glossy. The contrast can be extremely subtle that it’s hard to notice…and it’s drawing in color instead of painting it, meaning they’re thin pencils lines, not paint or pigments in broad strokes. Remember, you’re buying pencils and pencils work best on rough texture (like paper) and not on every surface.