Yup, i've done it. Not sure which method you've looked at on that DIY page (which by the way is a great site. Bookmark it NOW), but i've colormatched my sideskirts via the Castrol SuperClean method. If you take your time and get the grey soaked with the degreaser ... add a little elbow grease and you've just completed a great DIY for practically nothing.
The front/rear bumpers are solid grey plastic ... as opposed to the sideskirts which are the color of your car, but with grey OVER TOP. The plastic bumpers must be painted to be colormatched. Check around for estimates from body shops ... and do a search.
<span style='color:blue'>1992 325is
I think i'm in love ...
"Racing in a honda is like racing in the special olympics ... even if you win, you're still retarded."</span>