Sanding, Primering Car before Paint??

[vlgi]

The difference between wet and dry are not that great, wet sanding usually causes less dust, which I guess is beneficial if you're painting don't want that dust settling on the paint when its drying. Wet sanding also reduces heat generated when sanding, so in some applications that is useful.

When sanding if there is a lot of sanding back to do then you would start with a rougher (not rough really) and then a finer paper. I wouldn't expect you'd have to go too rough, a fine paper is fine.. Uhm I forget grades of sandpaper, was it around 4000 somethings, hrm that seems a bit high, I'm helpful yeah. I think something like P800 - P1000 is your rough sandpaper, and P2000 - P2500 is your fine sandpaper.

Also when getting sandpaper get the kind that is treated to avoid getting clogged with dust, which can really help lengthen the life of the sandpaper. Don't think it works with wet paper so much tho.

Don't know about the rustoleum stuff so much I guess its a treatment to protect against rust as well so its meant to stay there, just get a key and a smooth surface to apply paint.

Before rubbing down the car its probably worth cleaning the car fully, then using a clay bar to strip off any residual junk to get directly to the paint surface, and then once you've done that use a fine grade P2000 etc. to get a key for the paint. If you find P2000 is too fine you can move to more coarse papers, I guess in steps of 500 maybe.