Are any other eggs externally pipped? If you need to open the incubator to apply the oil, take the egg out quickly, mist the other eggs, shut the incubator. Apply the oil, very gently and don't get it in the bill or eyes. Just the membrane. Then open the incubator, put it back, and mist the eggs again. I'm pretty hands on during hatch, I remove shells, remove babies as soon as they're somewhat dry, candle unpipped eggs, and I just mist with warm water when I'm done. I've never had a shrink wrapped chick. I'm not saying be like me, but I've never had any problems with it. You'll be totally fine to open it up and put on oil quick.