I love pintrest. I seen somewhere a person used the stone type spray paint. I am the queen of spray paint! I couldn't even begin to tally everything I have spray painted. One of my favorite projects was spray painting my shutters on the house. The counter top - my go to thing? Spray paint. Now this is my second favorite spray painted project.
The secret is sanding to rough up the surface and letting the paint DRY throughly between coats. Also when you spray you want to "swipe" the color on. Not a continious spraying motion - you want to aviod runs.
Two coats of the hammered rustoleum and one coat of clear coat and viola a desingner counter!