so i need to replace both doors...the dirty pirate hooker who had the car before me smashed the right fender and door and the driver door had a dent so i got new doors but there white. I want to sand them down and primer them black. What grit sand paper should i use and can i hand sand them? I really have no idea what to do so if anyone could give me some opinions that would be swell..lol
k:
start off with a rough grit to get the paint off, but don't sand so hard that you put deep grooves in the original paint because with black, all imperfections will show. 180-220 grit is a good start. once the sand paper stops cutting easily, replace the sheet on the sanding block.
if the white paint is factory, all you'll need is to get all the clear off and scuff up the factory paint enough to promote adhesion, since it is already a good base for primer/paint to adhere to. if you're hand sanding, try using a few different sizes of sanding blocks so your strokes are uniformed. if you have to get down to bare metal (which you shouldn't unless the paint isn't original), be sure to use a self-etching or epoxy primer. you'll want to then use a slightly finer grit (320-400) now. you're going to have to build your way up to fine/ultra fine grit. lastly you'll want a few coats of high-build primer to fill out the minor imperfections. just follow the directions of the primer. the higher grit, the smoother your results. you're going to have to wet sand everything. when i did my car, i think i went up to 2000 wet/dry.
