2007-01-15T17:19:46Z PunBB http://www.finishingtalk.com/community/topic244$2.html Hi to all: I am a new user of this site; my business is classic car restoration, specifically, old Porsches. I am interested in all aspects of plating / refinishing that relates generally to restoring these cars. At the moment, I am trying to find out what is involved in restoring the original yellow chromate finish that the magnesium alloy crankcases had, back in the late sixties,when they were new. I have been told that it is potassium dichromate, and the cases were simply immersed in it for a few minutes. I tried doing this on a test piece, using yellow passivate from my zinc plating setup, but it has no effect at all. Can anyone enlighten me on this subject?? I am no plating expert! Also, any suggestions for removal of the oil and grease that gets absorbed into the surface of the metal over the years?? Any help would be greatly appreciated!! mike holloway 2007-01-15T17:19:46Z http://www.finishingtalk.com/community/post462.html#p462