Use 800-1200grit to take the damaged lacquer out in the 3-5 inch area, sand back to the actual paint layer but don't go through it obviously or you'll need to spray colour too, then 1500 to key the good lacquer in the rest, don't take too much out but enough to make it completely matt. spray so the edge of the foot spraying area hardly gets any paint, then the middle gets the most. build up lightly then once you have enough paint in, let it dry and sand the entire thing completely flat with 1500, so it's all matt and smooth like a blackboard. then just polish up!