Auto paint (prep question)?

I have been told to use 320 grit to scuff the surface of my truck.It will be shot with sealer,paint then clear right on top.I dont have a DA but a brand new porter cable 5'; random orbital sander and the paper is from the auto body supplier.Will I get the same results?ThanksAuto paint (prep question)?
I would sand by hand (my personal opinion). This a car, not wood. Also started with 320 and worked all the way to 1600 throughout the process. I have a very smooth finish .Heres a how to link that I used, and it worked perfect. These guys know there stuff. http://www.automotivetouchup.com/spray-p鈥?/a> good luckAuto paint (prep question)?
DONT use 1600. thats pointless and does not have any effect on how the paint is ';smooth'; on the end finish, besides paint wont stick to anything above 1500. use 320 on da on flat panels and 400 wet on the rest. 1500 is for buffing the clear.

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