Can a bumper re-spray cause issues?

[arinsd]

My wife was driving her year old Nissan and was hit from behind leaving very minor damage. We went to a highly rated auto body shop here in San Diego and they put a whole new OEM rear bumper... Today when we went to pick the car up the color was correct but a shade or two lighter than the rest of the car. I refused to take the car and they are going to re-spray it.

My question is: Does re-spraying the bumer cause the paint to be too thick? Would it be more likely to crack or wear sooner if it is re-sprayed?

Thanks for any answers, im just pretty annoyed at the whole thing at this point.