My $.02
Long winded answer!
I use enamel reducer and/or mineral spirits. I then go over the car w/ lac thinner, to get the last bits of contamination. I then go over the entire car w/ a DA, and 180g paper, wipe down w/ wax/grease remover. Once the residue is gone, and the surface is
clean/dry, I spray a LIGHT coat of "A MUST FOR RUST" on the entire car. The product is available @HD.. About $8.00 a spray bottle. 1 bottle will do a car, if used correctly.
USE gloves! This stuff has a weak acid in it!
I use a red scotchbrite to apply the M4R, so it's spread evenly, and there are NO puddles. Once dry, the surface is protected for up to a yr, IF the car is in a dry enviornment.
Once I get ready to begin work, I again wipe down w/ wax/grease remover, and go over the M4R w/ 180 and the DA.[This will make dust. WEAR A GOOD RESPIRATOR!]
Once this is done, I grind all areas that require body work, with an 36/80 grit on the 6" grinder. This does the prep for bondo.After a blowdown, I hit the entire car w/ epoxy primer. [I use PPG DPXX]. XX = 40,80,90, depends on color. Body work is next.
Once all that's done, all you have left is "finishing up"!!
I buy heavy duty gloves by the box..Cuts down on greasy finger prints, absorbtion thru your skin..
The above process was used on the last project..Ya, it's a HEMI!!
Ya, it's EXPENSIVE to fool w/ Mopars!