It may have been sealed when the stone was still wet. Water-based needs to be applied when completely dry. If this is so it must be stripped.

On Sep 1, 2011 1:58 PM, "Roger Konarski" <qm144@yahoo.com> wrote:
> I was asked to look @ new shower insulation. The issue is some
> of the limestone tile squares are turning whitish. The tiles were sealed with a
> water based sealer. From the best of my knowledge no acidic cleaners were used
> on the floor. Appreciate any thoughts on what is causing the problem. Please attach
> pictures.
>
> Thanks,
> RK
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