Hey GeminiIII, Here's an interesting quote from a recently published article on mobile-review, "The situation with the Sony Ericsson S500i buttons had been hard to foresee - it was just recently when we learned that the green paint reacted with the adhesive used for sticking the buttons onto the casing. This way, because of the chemical reaction the base of the keys simply dissolved. At the same time, the yellow edition is free of such defects."
Just food for thought...
The Full article is Here: http://www.mobile-review.com/articles/2007/brak-in-phones-en.shtml