That Makita sander polisher is something you'll need to color sand after you've painted.
Another option is to have everything sandblasted. I have used the local headstone maker (monument company). They have a huge sandblasting booth and charge by the hour to do it. All in All I paid about $300 to get my entire truck blasted. That was the cab and all the body panels, the frame, springs, etc... everything. After that you can etching primer it before starting on the body work and then a high solids primer. Some will aslo reccomend going over it with 80 grit before etching primer.
I have two compressors- a 25 gallon 5 hp $150 jobber and the one I bought when I figured out that wasn't gonna do it. There are several threads here on compressors. Generally, the consensus is if you are gonna paint, 80 gal two stage. If you don't have enough (volume) air your paint doesn't come out even and nice which means you may have to paint one panel at a time. That isn't a bad thing, just time consuming and possibly will produce slightly different colored panels.
Not all airtools or paint guns consume the same amount of air, shop around and find one that uses less cfm even if it costs more. Not all airtools produce the same rpms, so less cfm but less rpm's isn't apples to apples... All airtools need a couple of drops of oil every time you use them.
Best of luck!
