Auto body repair & detailing: 1972 GP restoration, primer surfacer, professional paint

Question
I am restoring a 1972 Grand Prix.  I have completed the mechanical restoration and now am ready to start on the exterior.  I want to sand it down to metal - fill in any of the small dings and then prime it.  I will have the paint job done professionally after all prep is completed.  I havent done this type of work in over 20 years so I am sure there have been improvements since that time.  What tools do you suggest for initial sanding (I do have an air compressor), what is the best type of filler to use for minor dings, and what type of primer should I use to prep the surface for a professional paint job?  I assume that wet sanding is still the final step in the prep.  If you can suggest a good book - that would be great as well.  Thank you!

Answer
Hi Lisa,

I recommend using a DA sander. Use the best quality filler you can find. Such as Rage Gold, Rage Extreme, or Fantastic. Use an Epoxy Primer on the surface first for corrosion protection and maximum adhesion then use a good quality 2K Urethane Primer. 400 grit is used for blocking.( Blocking is a term used for the process in which the primer surfacer or the finish is sanded with a flat block. (usually 6" to 36" long) in a crisscross pattern. When sanding, pull the block one direction about 4-6 passes then pull across in the opposite direction 4-6 passes in an X pattern. This will give you a flat surface.  If you sand in an --- inline pattern it will tend to dig a groove into the primer and result in a wavy finish when painted.) Blocking can be done wet or dry (I prefer wet).