Ask I-CAR
Per I-CAR curriculum: "The edges and backside of the panels are refinished to restore the appearance of the vehicle before the repairs. This task is generally performed before the new or repaired parts are installed on a vehicle. The reason this is done before installing the parts is to aid in complete coverage of areas that cannot be easily accessed or protected after installation. Parts that need to be welded into place may require partial refinishing before they are installed due to lack of access after installation.
Some paint makers recommend mixing clearcoat with the basecoat and using it for edging. This ensures that some of the clearcoat is applied and that the durability to abrasion and UV protection is enhanced."
