Depending on color, I've had pretty good results using the following products on my BMWs.
Using the touch up paint, fill in the crater gradually (layer by layer, letting each layer dry thoroughly) until the surface of the chipped area is higher than the surrounding area. Let this dry for several days.
Now get yourself some Langka (
www.langka.com) and follow the directions.
The repaired chips on the metallic black car are completely invisible. The gray car doesn't lend itself so well, while certainly better than seeing light colored primer, you can still see them in certain light. More a function of the color match of the touch up paint than the process.
All in all, the Langka does what it claims to do, can't ask any more than that from a product.