Wheel Centre Caps - how to avoid galvanic corrosion?

[Mr. C]

I have just had the 18'' problem wheels refurbished. I inherited them with pretty bad corrosion around the centres 3 month ago when I bought the car. Chemically stripped, Blasted, Primed, Powder coated (no diamond cut), Clear coated. Than I have sealed them with Gtechniq C5.

Now for the centre caps: What's the best solution to avoid the suspected "galvanic corrosion"? How have you handled it yourseves once the endless replacements in warranty stopped?

I am thinking to plastidip (clear) the original centre caps. Not sure what material they are made of that promotes galvanic corrosion? It seems light like plastic with some metalic coat painted on the face. Are there any other alternatives available to buy apart from the BT sets (nice but too expensive) It seems that the 2 1/8 hole diameter is not very popular with the universal centre caps.

Before pic:


and after pic

[MADDOG]

I'd coat the with some clear automotive grade paint.

[Simon@thecustom300cshop]

I put grease around and inside them, it does throw some out for a while but I haven't had any corrode around them since.

[Mr. C]

Thanks for the suggestions, I ll try both. Will clear automotive grade paint insulate (from the electrical point of view) to avoid the galvanic process? My first experiment using a plastidip clear aerosol didnt come out satisfactory: air bubles trapped in the layer that don't disapear as it dries leaving some opaque patches. It comes out easily though if you're not happy.