Try an oil-base stroller (Strip-X at Home Depot). Paint/roll on, let dwell for 10-15 min, then scrape off. Then go over it with a black pad and water-base stripper to remove tacky residual residue. Then neutralize.
Do a small test area first.

On Jun 13, 2011 10:48 PM, "Mike Marsoun" <nulifesc@bigpond.com> wrote:
> A complex that wanted waterproofinng of the grout. So someone came and mopped on a sodium siliconate sealer and it left this residue. I did samples with a stripper and black pad, weighted machine and it worked fine, but these balconies, it is thicker and not working. It is glazed ceramic with a non slip (glazed in glass bead) surface.
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