I built a new home in 2003 and purchased a Kohler standard sized porcelain double bowl sink. After about 2 years it burned and etched and every time I would barely touch anything aluminum it would leave a black streak. So in 2011 I replaced it with another Kohler porcelain sink and it is doing the same thing. Obviously my next one will be Stainless Steel.
I notifind Kohler about this and they wouldn't even contact me.
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