Acid Stain/Acrylic Sealer Problem...Efflorescence?
We poured this residential, interior slab 6 months before we colored and sealed it. It has radiant heat Pex tubing in it and a vapor barrier underneath. We scrubbed it with a floor machine and moped and vacuumed it with fresh water before we allowed it to dry and stained it with an acid stain. The surface was then moped with a solution of vinegar first and then with fresh water several times. Two coats of an Acrylic sealer was then applied. We had a little trouble with lines so we used some xylene to level it. A few days later some cloudy areas began appearing. Over a couple weeks most of the floor was discolored and rough looking. Most of it is a dry, rough looking gray. Some of it even looks a dark brown or black with the texture of rust on metal.
What is it?
What can I do?