Stephen
Could also possibly be the factory coating .
In some
Cases their material comes coated with a lacquer
See if you have some spare pieces and if they are raw.
I have run into various issues when stripping Saltillo and terracotta.
If the spare pieces are raw Saltillo chances are it's the acrylic that was used after the install.

Sent from my iPhone

> On Jun 8, 2015, at 1:12 PM, Stephen Webb <stephen@newlifemarblerestoration.com> wrote:
>
> I'm stripping a lanai with Mexican pavers and under the clear top coat is a milky coating that has partially come off. what sealer would produce a milky coat? I need to replace it so it matched the inside of the condo. Thanks
> Stephen
>
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