Dan, I p/c over chrome all the time. It isnt the best way to do it, but it can be done. Things to look out for are, quality of chrome, (age of chrome) type of metal under chrome. For example, it you try to do a die cast rim, you are asking for a lot of problems & here is why. In diecast there tends to be pits in the metal that hold gas & when heated it "outgasses" causing the chrome to bubble.
I just did a set of diecast rims that were brand new that gassed, talk about frustrating. If you have to absolutely pc over cast rims, then heat the oven like at 250 degrees. I did mine at 350 & it bubbled, but the one rim that was near the top of the oven, fartherest from the heating element didnt bubble as bad, so that is why I recommend a lower temp.
The only other way to really do it rite, would be to strip the chrome then heat the diecast & while hot shoot it with powder. This will keep the outgassing minimal, as it will already be outgasses.
I tend to use the translucents over chrome as they look so good when done.
I have a snare that is transblue over chrome & I do nothing but rim shots & it is holding up really well. I wouldnt recommend clearcoating the final finish, I just dont think its neccessary.
Hope that helps...
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