A Core deposit is a form of deposit you pay until returning your old part. If you don't have the core at the time of purchase, you must pay the core charge. That charge is refunded to you when you return the core.
Inspection spray is used to inspect surfaces for remaining sand scratches after buffing. The use of Inspection Spray allows sand scratches and other defects to be more readily seen. Inspection Spray will not harm paint and leaves no residue.