Download FORD: Crown Victoria, Taurus Ford GT Mustang Ranger Expedition Explorer This article supersedes TSB 04-25-1 to update the vehicle model years. ISSUE Some vehicles may exhibit a bubbling or blistering under the paint on aluminum body parts. This is due to iron contamination of the aluminum panel. 1. Corrosion should be removed by blasting. Use an aggressive blasting material, such as acrylic (salt grain size). 2. Use a DA sander with 180 grit paper backed abrasive. Only sand and featheredge the damaged area. 3. Mix and apply Ford approved epoxy primer, per the manufacturer’s label instructions. Bake at 140° F (60° C), or use an infra-red lamp for curing. 4. If necessary, mix and apply two-part polyester filler to a slight over crown.