Not sure about the clearcoat thing, but your best bet is to stay away from anything chrome.
Factory one's hold up pretty well.....then there are black one's. Black hides rust a bit better than chrome.

How bout a set of these?

 

never thought of black ones..im sure they stay black after the 1st impact hits them?

 

your talking about the cover nuts right

 

who uses cover nuts? Whats that birth control for hemis?

 

yea i think i lil spray of clear coat and a good coat of wax should help ya out
EDIT: would only spray clear on painted/powdered lugs. chrome i would use neverdull to get the rust off and follow up with wax