I am curious why they thinned the paint so much and then spent so much time sanding out runs before applying additional coats. Seems to me that it would be better to leave the paint a bit thicker, apply the first coat, let it dry 24 - 48 hrs, wet sand it, and apply a final coat. After about a month it should be cured enough to wet-sand and buff out the brush marks...

Regardless, I'll leave it to someone else to try. I have several nice spray guns out in the garage.

What about cheap paint, though? Has anybody tried any of the industrial enamels that are available at places like Lowe's or Home Depot?