Lots of car manufacturers had lots of problems with long term durability of clearcoats when they switched to low volatiles paint. Silvers seem to be the worst, but any color can fail. Takes sanding affected panels down to base color and respraying. Down here in Houston, it costs $50-75 per panel to strip to base, that much more per coat --color then clear. If it really bugs you --not having a PERFECT pain job--go spend $65K for a new one with its imperfect paint job. MBZ paint jobs are no better than 3rd class anyway--they don't rust, but are far far from 1st class.