Cost of a single-color paint job?

I had a couple estimates done. My father and I did all the body and metal work, would have the car ready for paint. Both shops insisted on their own final block sanding. They figured 60hrs labor at $72 per plus materials put it at 7500 for both. We purchased the paint ourselves for 1900. Still waiting on a local painter to give us an estimate on just paint and masking.