What is the best way to permenantly take of my 300CE valve cover?

Is it made of aluminum or mag and could I powdercoat it?

I have done a search but there is no real solutions that I have found.

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Norm K.
'97 E420 Sport
'06 E350 Sedan
'67 Mustang Coupe
'70 F-250
'15 VW Jetta