Guys, if you are thinking about doing it yourself, the most important thing are primer!
Without this don't bother. If the prime is nice and thick, with smooth sanding, than you only need, not so much of the actual colour. You have to sand the grains back, before you paint. Ok, now you have painted it. DO some more fine sanding before glossing it? 1000R paper.
Second most important thing is to put lots of gloss on it. Topcoat clear. So you can polish the thing later. And you have to give it few layers. 4 max. Coze buffing will wear it down.
The thing is a guys, if you sand the thing down, and put prime yourself, the painter will only cost you $80 bucks. That is very good considering the leaking spray scenarios at home.
Oh yeah, the painters have extractors on the roof, and much better equipment, like 6 to 12 hp painting machines with better flow ratios than the cheap home ones.
So if you want it looking good. Well then