Sanding factory paint down to primer with 7424XP?

[2old2change]

Curious as to why you want to sand down to the bare metal. The surface could be made smooth enough for a rustoleum paint job by simple wet sanding. The electric pc will do the job if a little caution and common sense is used. I have used a da many times to wet sand by misting the panel and soaking the paper before slapping it onto the bp. If you are convinced you want to go down to the bare metal then a liguid paint stripper would be my choice.

[BrutalGT]

It was basically just guessing since this is my first project like this (and not much online really states how far to sand down). For the rest of the body panels I will just be sanding off the clear coat and prime/paint over the existing paint.

So I finally just finished prepping the hood and sprayed a coat of primer on it. The basic little guide I am following says he sanded with 320, did a second coat of primer, sanded with 320 again and then painted.

Once I sand the first coat of primer (and later sanding in between painting) what is the best way to clean off anything that has been sanded? I used 50% alcohol/water before spraying primer, but curious what is recommended once primer or paint are already down.

Thanks for all the help!