Interior Painting standard system 2-3 coats of putty is applied along with primer. Primer provides adhesion and Putty provides smoothness. After that one more coat of primer and then 2-3 coats of paint is applied.
While re-painting walls first comes ‘touch-up putty’ wherever there are surface cracks; followed by a coat of primer and finish it up with 2-3 coats of paint.
Studio Painting refers to painting of a studio apartment which is a trend now a days.