dark water rings on certain granites

Hi Maurizio, why is it that some granite counter tops get a dark stain when you leave a cold glass and some not. Does it have to do with the sealer? We have Gallo Antico installed and everytime you put something wet it gets stained (goes back to normal when completely dry). Thank you for yout response. Patricia

 

Dear Patricia:

It has to do with more than one factor.

 

1. Certain granites or “granites” are inherently too dense absorb anything. (These kinds of stones can't be technically sealed.)
2. Certain granites or “granites” that would be inherently absorbent, they are no longer so if the slabs get resined by the factory. The resining process effectively and permanently seals most stones it is applied to.
3. Certain granites or “granites” that are inherently absorbent will not show those dark markings if sealed properly with a good-quality impregnating sealer. Keep in mind, however, that even the best impregnator on the market will only give you ample reaction time – never 100% sealing performance.

 

Now remember, it's never too early to think about the proper maintenance of your stone. The issue of what you'll be doing day in and day out to your stone is – as it should be intuitive – vastly more important than its sealing (if and when possible and/or advisable) and it's all too often neglected. As you can tell by reading many of this site's postings, you're not likely to get good information about routine care from your dealer or installer. Don't become another statistic! By logging into the Helpful Hints section of our website at:   http://www.mbstone.com/ HH_promo/helpful_hints.htm, you will be able to get the short version of our maintenance guidelines at no charge. The full version of it – a 7-page document considered by many as an industry benchmark – is available in pay-per-download format in our Educational Literature section at:   http://www.mbstone.com/literature/ literature.htm.  

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Ciao and good luck,

Mauri z io Bertoli

 

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