Mechanical (or non-reactive) staining includes dyes, sealants, and tented coating. These topical solutions are added to the top layer of polished concrete slab and deliver vivid color and great results. These liquid strainers are poured, sprayed, or brushed onto slabs. When comparing Acid Staining to other mediums, it’s important to consider non-chemical staining does not withstand wear and tear as well as acid staining. If chipped or cracked, the natural color of the concrete slab could show through.