Encore Coatings LITHIPRO 1 gal LithiPro LP Concrete Densifier/Sealer - 4 per Case eliminates the possibility of efflorescence on new pavers and concrete the easy way. Simply spray LithiPro LP onto the surface and keep it wet for 20 minutes. During this time, this superior lithium-based densifier penetrates deeply into the surface (up to 3?) and hardens the free alkali that would otherwise rise to the surface and form unsightly efflorescence! One application is considered permanent. LithiPro LP not only stops the occurrence of efflorescence, it also densifies, increasing the strength of the concrete or paver by up to 30%! One gallon treats up to 600 square feet depending on the porosity of the surface.