When problem started (9-2014) didn't seem that bad but has gotten worse was one area now 5 different ares on vehicle. Started on back double doors just above and below body stripe went from there to above windshield then too hood and side doors as of now the side doors have smallest area affected but expect that to change soon since all other area begin pretty small then grow with age. The primer most of time has remained intact thank goodness no rust but also live in desert. Have seen other Chevy's with same problem.