“Treated surfaces (treated with Fast Etch) should be wiped with PRE Painting Prep (10041 Z) or thinner before priming and painting.”
“Prior to using Fast Etch make sure the surface is grease and oil free (PRE Painting Prep), knock off the loose rust and spray or wipe on the Fast Etch.” 
One states to use Pre-Paint-Prep before Fast Etch, and the other states the opposite. So which is the correct way? If the answer is Pre-paint-prep after Fast Etch, would it wipe away the desired phosphate coating left behind from Fast Etch?