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Neutralize the hydrochloric acid stain on the floor by spraying the floor with a mixture of four parts water and one part ammonia. Apply this ammonia-water mixture with a clean two-gallon plastic pump sprayer.
Allow the floor to dry again and thoroughly clean the floor using a clean mop. Vacuum up any extra water and allow the floor to completely dry before sealing.
Sealing the floor protects the concrete from food and everyday wear as well as enhancing the color of the acid stained floor. Many kinds of concrete sealers can be used on the floor. In this case a clear high gloss water-based sealer was used. Applications differ with the type of sealer so be sure to follow the manufacturer's instructions. Using a paint roller, apply the sealer to the floor. Apply the sealer in multiple thin coats rather than one thick coat to ensure a better bond. Reapply the sealer until you reach the desired finish, usually two coats will suffice.
After the floor has completely dried for 24 hours, remove the masking paper and reinstall the trim work.