Repainting over chipped paint involves scraping, filling, sanding and painting. If not attended to, the chips or cracks will get worse until the entire surface becomes unsightly.
The first step in repainting over chipped paint is removing the chipped surface until it is smooth. Using a scraper, sandpaper or wire brush, go over the surface several times until the edges are feathered or blended in. The surface should feel smooth to the touch and all loose paint should be removed.
If the chips are deep or there are gouges present, a filler can be used to fill in the layers. The surface then needs to be sanded smooth.
After smoothing the surface, it should be primed before applying the paint as this will produce the best results.