Proper Rim Refinishing includes the face, inside the drum and back face of the rims. The only section of the rim that does not get sand blasted and powdercoated/painted (depending on the finish you chose) is on the outside of the drum three inches from each rim. That centre section is never done as it serves no purpose and is enclosed by the tire completely. Therefore every visible spec of the rim is redone including all areas in contract with the tire.
Shit that's kinda hard to explain lol
1992 325i / Briliant rot - SOLD @ 301,000km
1998 318is / Arktic silber - SOLD @ 207,000km
2007 335i / Jet Black - CURRENT @ 28,000 km