body work questions

Before he started I told him I didn't want to spend 10 grand on paint. Then when i sat down with him and gave him 2500, he told me he had about 100 hrs in it so far, which included body work and the car was in primer at that point. He said it wouldn't be much more to finish... 5k with materials, so I was planning on 6000-6500. I just dont know how you spend 150 hours spraying it with paint and wet sanding?