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If you can get nice, even, solid coverage from your spray, there's no need to paint over it with the same color. Painting grey patterns over white will be the fastest method (white has poor coverage, but it's easy to apply darker colors over the top of it), but shading white is tricky. You may actually have an easier time priming in a light grey which can be highlighted up to white, then painting your grey patterns, as before. Either method gives you a white base to apply patterns to, it's just a matter of shading down or highlighting up to get there.
Using the light grey as your base, instead, is another option, but it will change the look. You'll have to do some tests and see which scheme you prefer. If it's the grey, you needn't worry about your methods - that painting is nothing new, you may just have to apply a few layers of white to get a solid pattern.
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