3M™ Inspection Spray is used to inspect automotive surfaces for lingering sand scratches after buffing. The gallon of inspection spray contained within this can helps operators detect sand scratches and other defects that may otherwise not be readily seen. It does not harm paint or leave residue.When it comes to inspecting vehicles for scratches and marks, you can't risk unseen sand scratches. The 3M Inspection Spray is designed to help technicians locate these scratches even in difficult lighting conditions. This automotive inspection spray is specially made to reveal swirl marks and sand scratches after buffing.