I assume you're asking if it's acceptable to use acrylic urethane base coat / clear coat for concours. The answer is yes. And if it's a metallic color, I strongly suggest bc/cc.
If your intention is to compete in the highest level of concours restoration, I wouldn't go with bc/cc. The judges can be very picky about paints. Heard of one VMFer loosing points for not having enough orange peel.
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