Key around the repair prior to applying etch primer using a 3M™ Hookit™ Purple+ Abrasive Multihole Disc P320/P500 (50531/50534). Awkward areas can be sanded by hand using Scotch-Brite™ Hand Pads (07447) or Scotch-Brite™ Pre-Cut (07904). For difficult to reach areas Scotch-Brite™ Multi-Flex (07521) can be used.
Apply Primer according to paint company recommendations to repairs, keeping spray area to a minimum and avoiding hard edges. Dry to paint company recommendations.