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Per I-CAR curriculum: "Coatings applied by the vehicle maker must be restored during repairs where the coatings have been disturbed or removed."
Check out the I-CAR Collision Repair News article: When to Apply Corrosion Protection During the Repair Process
Check out the I-CAR Collision Repair News article: Don't Forget the Corrosion Protection
Check out the I-CAR Collision Repair News article: Back-To-Basics: Corrosion Protection Inspection During The Repair Process
Check out the I-CAR Collision Repair News article: Corrosion Protection To Structural Part Interiors