I recently obtained a few stone chips on my bumper from a low wall. I have tried repairing these and found the Halfords Scotia white paint set to be quite good at blending the marks away. The problem I ran into was some 'blobbing' of the paint which led to an uneven look. Have found a good site on how to repair this though.
http://www.unofficialbmw.com/repair_faqs/paint.html
Needed to cover up the little marks just in case they rusted. Has anyone else ever tried this and had good results?