Well I'll go back to my earlier post and say again that there is a "tool" that will do a farly quick inspection for skin damage. Not to say that any of the other posters are not correct, just that Boeing has addressed the problem at this hour.
How do I know this? It was discussed by a Boeing maintenance instructor some time back and unfortunetly I have forgotten a good part of the details at this hour. Give me another week and I'll tell you the latest on this subject