Clear shouldn't from normal use. Mine have been installed over a year ago now and I put over 50K km/yr and they show no signs of wear I smoke and drink coffee, etc in the car when on the road, so the interior gets alot of wear and tear and still nothing.
If by some chance it does wear or need to be "repaired", it's just a quick sand and re-spray, but I really don't expect much of any of that to be happening....
2009 335i Xdrive
JB4 and BimmerBoost Back-end flash
AA race FMIC and Diverter/Blow-off
& a few other goodies