Use "save as" wavefront obj from RDS instead of "export. This seems more reliable. If you split the different colored objects apart in RDS before saving as obj then UVmapper will be able to re-map each individual part (still one tex map). Go back to the freeform model and add control points and create cross sections before and after each silver part. Duplicate model and rename to "silverparts". Then jump in and disconnect the silver parts from the other. Do the opposit on the original and you will end up with two groups in perfect position. One for silver parts, one for balance of pen. Now they can be "shaded" in RDS or Bryce or can be run through UVMapper for new map.