I would say any time the damage effects the ball performance. Light scratches generally aren't going to cause any issues and are unavoidable. If chunks are missing. long deep gouges or cracks then repair is needed. Especially cracks which could grow if not repaired. A PSO should be able to tell you if a full resurface, simple repair or if a mere scotch brite or polish on a ball spinner is needed to fix up your ball.
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