There is no place where you will get quality work.Most of them use branded hardner and paint only.FOr a perfect finish your painter must use stuff of your choice..
For e.g If you are going for Nexa
K-12 putty/Nexa primer/Nexa thinner/Nexa hardner/Nexa clear coat but no one does that.Thook laganay wali baat hai.You are paying them 60k for a job and they hardly spend 15k on the materials.
I am getting my car repainted and the paint system is of my choice ofc i am giving extra for a better finish.