I somewhat agree with all above. After blasting I have used a scuff pad to clean up roughness. I then use a derusting agent/metal prep then I prime. After priming, sand dry then switch to wet. As stated above paint instructions and MSDS's will give directions as to their brand. Sometimes it goes well, other times I've redone. Preparation is the key. Good luck and have fun. Pics below.
Dan
http://rides.webshots.com/photo/1512695955071274430lWhMwv