Drylok Brush is a 4-inch synthetic bristle brush especially designed for applying Drylok masonry waterproofer, Drylok concrete floor paint and Drylok Etch. Cleans up easily and is reusable. Surface to use concrete, wood decking, patios, wood siding, concrete decking, brick, stone, masonry, and patios. Chiseled tip helps achieve professional-looking results.