A.Tile-setter and JLC contributing editor Michael Byrne responds: Saltillo pavers have always been among my favorite tiles because of their unique handcrafted appearance. I have used a wide variety of colorants and sealers on them, including aniline dyes, opaque stains, penetrating oil, hot paraffin and naphtha, beeswax, and other materials that do not react with water.
The few times I’ve seen problems with a cloudy finish, the culprit was latex sealers, which are not intended for exposure to damp conditions. The cloudy haze appears when latex in the sealer begins to re-emulsify. Although I can’t be sure without examining them, I would guess that this is the problem with your tiles. Since they were fired before...
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