I've had Stellar Night Silestone for six years. I have only used vinegar Windex (without amonia). The last several months I have noticed a lot of watermarks. I was thinking of trying that 'impregnator', but after reading as much as I could I was afraid to try it. I've never gotten any response from Silestone from my inquiries. I was surprised to read that pikelk saw them 'shave' the watermark off. Did they have to polish it after? What size of watermark did you have?
Thanks for the info