Do a respray and then 3M it. I did that with my E46 and it underwent 25,000kms of multiple US roadtrips. The 3M did it's job and not ONE chip appeared on the bumper.
Going to do the same on the E39 in a month or whenever it's on the road.
Imola Red / Imola Red ///M5
E60 SSK, Dice iPod, Illuminated ZHP knob, GT Custom Exhaust, BCR Coilovers
'01 330Ci Titanium Silver on Coral Red
'96 328i Jet Black on Black