Seal & Stain Your Concrete! Customer applying our LastiSeal Stain & Sealer. LastiSeal is best applied with a hand-pump garden sprayer. One saturating application is usually sufficient for poured concrete. A second application may be needed to waterproof a very porous substrate or to achieve a more intense color, particularly with lighter stains. Application Instructions & Prep: http://www.radonseal.com/color-sealer/color-sealer-appl.htm