Thanks very much for your response. It's quite helpful.

Did he state why spraying on was better? - He stated that the spray
paint goes into the cracks, etc. better.

My concern would be one of potential overspray, and how they manage
that. - That's my concern also. I'll have to ask him about this. The
neighbors are too close and they just bought a new truck - don't want
paint getting on that.