[Chambers]

Well you want to sand all of the existing paint, rust, dirt, grime, and debre off to a decently smooth surface. That will allow the new paint to adhere easier to the surface you are painting. As long as you prep it and lay a decent coat of primer on it the paint should be good. I also forgot to mention when laying primer you can use a high grit sandpaper on it to help get a smoother finish for the actual paint in the end.


What I meant by taking to much off is when you have a high rpm sander it will take a lot more material off quicker than sanding it by hand, you can use a sander such as that but in my opinion sanding it by hand is a more controllable way of sanding. I have used a high rpm sander and ruined things I was working on because the sander took to much off.

Either way good luck, and make sure to post some pics of your progress.