help post acid etch

[arrowspark]

Hi I just finished acid etching but noticed that whenever the garage floor bwgins to dry there is white caking on it. I tried power washing it off 3 times now and it keeps coming back once the floor dries. Ayone know what it is. Is it normal or a symptom of something I didnt.do right during etching. How can I get rid of it? Will it effect the epoxy coatings?

 

[Shea]

That white powdery residue is calcium carbonate which is from the result of etching. It will occur when you don't flush and rinse your slab well enough. Usually though a power washer will remove it.

Try wetting down the concrete and scrub it with a salt remover/cleaner. Then use the power washer to rinse it. If that doesn't work, then re-introducing a mild acid solution to your floor again will emulsify the residue. Neutralize it, flush the floor with lots of water, then use your power washer on it.