Backing the red with white will make it a brighter colour.
If you back the red with black it may look darker than you want.
I would paint the black first, then the red.
If you want the red to be a brighter colour then buy some white paint, if its ok (and not transparent) then it will be ok without any backing.
It depends on the paint you are using and how much you put on.
You could cut some bits from the edge of the body (if its not cut out) and test the paint on them and see how it looks with just red, and red backed with black.
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