How can you tell if a curing compound has been used on a concrete slab scheduled to receive ceramic tile?
The best method to check a slab for curing agents or other coatings is to apply Muratic acid to a cleaned area. If the acid “bubbles,” the mortar should bond. If acid does not “bubble,” remove the surface of the slab by scarifying with: a H.D. machine sander, bush hammering, sandblasting or a “shot blasted” (a self contained abrasive recirculating machine). Check again with acid to make sure a bond can be obtained.
