Hi Guys,We just had a close friend of a customer call in a panic because he used CLR, a strong acid on a "granite" sink and it left "etching". We are going to go look at it. We don't know whether it reacted with a seal or whether the matrix is made up of calcium based stone and resins and it truly etched it. Does anyone have any experience with this?PresidentMobile: 309.251.3192Visit list archives, subscribe, unsubscribe or change your subscription preferences: http://stoneandtilepros.simplelists.com/sccpartners Start a new conversation (thread): sccpartners@stoneandtilepros.simplelists.com