We only use solvent base sealers on exterior slate installations. The water base sealers do not hold up well in the UV light outside.

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On Aug 14, 2015, at 2:39 AM, Tony Warney <tony@excelstoneandtilecare.com> wrote:

I have a client with slate on the outside of a large commercial building. They have put Glaze and Seal Wet Look 2000 (Lacquer) on every 3-4 years for the past 10 years. It has worn off in many areas, especially ares where water is used a lot. My idea is to use a water based sealer over the
existing slate after cleaning. The lacquer is high in Voc;s. Lots of complaints from tenants and slow drying time. would putting water based sealer over laquer work? I am thinking it would hold where th lacquer has worn off.
Tony Warney
Excel Stone and Tile Care
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