Dear Mike:
“
But we did get a stain when some strawberry juice sat overnight.
”
You could have used the best super-duper impregnator in the entire galaxy and have it applied in the best possible way, and you still can take it to the bank that if you leave some staining agent on your countertop overnight it will get stained.
There's no Teflon on that product. There's no Teflon in any impregnating sealer on the market. There use to be a version of it several years ago but it was banned by either the EPA or the OSHA (I don't remember which). Even I back then had to change the formula because we were using a variation of Teflon in our own impregnator.
That duly said for the record and keeping in mind that the “perfect” sealer does not exist, you probably don't even need to seal your stone again. To find out do this:
Spill some water in a couple of spots of your stone, let it dwell for 5 minutes or so, wipe it dry and observe if the areas under which the water has been sitting have become (temporarily) any darker than the rest. If so, then you will apply a good-quality impregnating sealer. If not, you won't. And, BTW, yes, I confirm that using the same make of impregnator is always the best bet.
“
Is this a problem and might that be the source of the pitting?
”
Nobody can tell for sure, but it is indeed a distinct possibility. It is taking chances anyway. Do read the free article about cleaning stone surfaces with dish soap and glass cleaners that you can find at:
http://www.mbstone.com/HH_promo/helpful_hints.htm.
May I ask you now to please read and e-sign our Statement of Purpose at:
http://www.marblecleaning.org/purpose.htm?
Ciao and good luck,
Mauri
Article ID: 1300
Created On: Mon, Mar 10, 2008 at 2:48 PM
Last Updated On: Mon, Mar 10, 2008 at 12:00 AM
Authored by: Maurizio Bertoli [mail@mbstone.com]
Online URL: https://marblecleaning.org/knowledgebase/article.php?id=1300