Generally, any metallic paint may, and normally does, affect 'solid' colours, for example, white, if the 'solid' is applied over the metallic. This is due to the metallic particles 'migrating' from the surface, into the base of the 'solid' colour when it is wet. With white paint, this gives a greyish, specular effect. OK, it can be re-coated, but it can take time to cover effectively, and can end up looking 'lumpy'.
Also, it is far easier to mask a 'solid' colour, without risk of staining, 'picking' or other contamination (from the tape), than it is the other way around.
However, some gloss colours, such as red, for lettering for example, can sometimes be brush-painted onto a metallic finish which has had a few days to harden and settle, and has then been 'rubbed over' with a soft cloth, to remove the 'loose', top surface metallic particles. Remember, we are talking about a small scale area here, where any teeny weeny imperfection will seem magnified. The same 'fault' on the full-sized object - car, aircraft whatever - would harfly be noticed, if at all.