Stephen, there is a good chance that it is a thin coat of paint. I have run into Saltillo with different colored painted coatings under the sealer. There are a number of sites that cover this, but here's one that suggests masonry primer followed by acrylic floor paint followed by polymer.
http://homeguides.sfgate.com/paint-terra-cotta-floor-tiles-31807.html
B

________________________________________
From the desk of
Baird Standish
Managing Partner
Facility Specialists, LLC
15 West Highland Ave. Suite E
Philadelphia, PA 19118
Phone: 215-732-7505
Fax: 215-546-9160
www.facspecs.com

> 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
>
> ---
> This email is free from viruses and malware because avast! Antivirus protection is active.
> https://www.avast.com/antivirus
>
> Visit list archives, subscribe, unsubscribe or change your subscription preferences:
> http://stoneandtilepros.simplelists.com/sccpartners
> Start a new conversation (thread): sccpartners@stoneandtilepros.simplelists.com
>