Our #1 Selling Sprayer! Designed for acid staining and spraying all types acids and acidic cleaners. This is our recommended sprayer for acid staining, etching, and efflorescence removal. It also easily sprays most water-based concrete, masonry and paver sealers. Not for use with solvents, acetone or alcohol. Available in a handy 1/2 gallon hand-held size and 2 gallon full size model.