A reusable, 4 In. synthetic bristle brush that works beautifully in the application of Drylok Latex Masonry Waterproofer, Drylok Extreme Masonry Waterproofer, Drylok Latex Concrete Floor Paint and Drylok Etch. 4 In. synthetic bristle brush. Chiseled tip helps achieve professional-looking results. Extra-firm bristles ensure maximum coating. Great for masonry waterproofers, floor paints, etching compounds, deck and siding stains, and other full-bodied coatings. Use on concrete, wood decking, patios, wood siding, brick, stone, masonry, and patios. Interior/exterior use. Reusable.