im not sure i understand what your saying here.. you have a chip on your rim... which means it got hit or scraped or something along those lines right?? well the part im unclear on is... it is a white chip? the wheels are gun metal, not white... and they arent white underneath (as far as i know)... i just dont quite understand what your saying... however, I can provide somewhat of a solution. If you can find a shop in your area that does it, you can get them fixed... there are shops that will take wheels that are beat up (alot of times tho, wheels are beyond the point of repair) and clean em, sand em, smoth em, and re-finish em to a point that is almost as good, if not as good as new... not sure on pricing or the exact procedure or materials/products they use... but im sure you could call around and get more info... or maybe someone else on the board has got somethin more for ya
good luck
Peace