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Well, since you're asking for advice...
With black you have gloss black, satin black and flat black. A lot of the mismatch you see isn't the color as much as the gloss. You might do better to make the bumper satin black instead of trying to get a gloss black on the coroplast.
To my eye, in the picture the top edge of the two pieces doesn't look straight and aligned. The pieces could have straight edges and not be held flat against the bumper. Use at least twice as many fasteners, with color-matched heads. And you could lap the pieces in behind the license plate and conceal that edge.
All that comes from too many years of wandering around in custom car shows. You need to get some buy-in from your wife. Have her paint the screwheads or something. Then she can take pride in it.
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