Sorry for the late reply, I saw that one of our fellow Pakwheeler has already clarified the general difference for normal and Bake paint procedure............ btw in local term of painters its called "Bhatti paint"
Then atleast you should try to preserve the original paint of your car's roof..... just get it wrapped for fresh look
For me there were always two options for getting my car works done as per my requirement:
1- Go to some good n workshop and give them the responsibility..............this costs more but you are free of "Khwari"
2- Get the car repaired yourself under your supervision step by step.................. some bucks saved but lot of khwari.....lesser risk of not getting what you wanted
If you are already planning to spend 60k then maybe you can spend another 30-40K on the car for perfection this will eventually pay off when you will sell the car.