Paint advice

Epoxy (DP40-50-90) (reduced) first over bare metal (80grit it with a DA for good adhesion) then you can do your body work on top of the epoxy as long as it's properly scuffed.

Remember get your metal close with good tension then use your filler and 36grit then finish with 80; after fill the scratches with finishing bondo then 150 and use a low build primer. (DP20) Then after it's been wet sanded use a sealer (Reduced Epoxy again) base and clear or single stage.

High quality bondo will make your life a lot easier (evercoat rage gold) use bondo thinner for the skim coat and don't undercut it. This way will save you money and give you a much better finish job then all the people who say use lots of primer. Don't forget how expensive primer is and how much it can/will shrink and chip under the paint.

Don't forget your straight edge and use your long board**** (Use the straight edge to check to make sure the panel has the proper rock and to check for high points)