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How to prevent PCB appearance defects?

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fastpcb021

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Here have some measures, please check whether are right? If have better measures, please advise.

1. Exposed copper: There is no timely processing out of oil area;
2. Not balanced IC Sn surface: Don’t carefully checked IC area after Hot Air Leveling;
3. Repair: Worker single-handedly take-off and release board to make boards overlap each other in repair, or off oil; or don’t timely separate the boards after re-print oil;
4. Scratching: Worker single-handedly take-off and release board to make boards overlap each other in transport products to cause scratching.
 
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