Check Youtube for videos on painting Rustoleum with a foam roller. They did an amazing job and looked like high end paint job after wet sanding and polishing. You need to get a lot of material on there to do the wet sanding so you don't go through to the primer. I prefer the Valspar that you get from TSC @ about $11/qt. They also sell a hardener/glosser for about $12. 2 quarts and a bottle glosser and about 6-7 roller and you're at about $40 and no overspray.
https://www.youtube.com/watch?v=jv7aQQ_NU6U