Paint - Color Sanding Basecoat/Clearcoat Finishes
Bulletin 86-10-24Date
Sept. '86
Ref. No. 86-166-10
SUBJECT: COLOR SANDING BASECOAT/CLEARCOAT FINISHES
MODELS AFFECTED: ALL BASECOAT/CLEARCOAT PAINTED VEHICLES
Some dealers and owners are attempting to improve the exterior appearance of new basecoat clearcoat painted vehicles by complete color sanding and polishing.
Complete color sanding, regardless of a vehicles age, is not recommended. Color sanding reduces the clearcoat thickness along with the necessary ultraviolet radiation screening protection that is required to prevent peeling of the clearcoat and discoloring of the basecoat. Adequate protection requires that the clearcoat thickness be at least 1.4 mils. If extensive color sanding is performed, additional clearcoat should be applied to maintain clearcoat depth.
Color sanding should be limited to the removal of small isolated paint defects such as dirt, scratches, sags and chemical spotting, providing that the defect does not penetrate beyond the clearcoat. If the basecoat and/or primer are affected, repainting is required.