Guide coat each stage. Some will go to 600 but that's more important with metallics (a missed heavy sand scratch will show in metallic base coat). Ask 10 guys and you'll probably get 10 different suggestions.
Yea for sure. The color is Plum Crazy Pearl (PHG) I'll contact the paint manufacturer to see what they suggest. I just wasn't sure if it was ok to jump to 600 without laying down more material.