You will never cover a dark color with one coat unless you are keeping the same color or a very similar shade.
Plan on two or maybe even three coats for a uniform appearance.
If you're changing the colors dramatically, start with a good brand of primer tinted to match the new color, then give it a coat of your finish shade. Let it dry and decide if it looks good enough.
Chances are it will need a third coat if the final finish color shift is drastic compared to the base color.--
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