SAKRETE | Concrete Bonder Fortifier | 1 gal Gallon, sakrete concrete bonder fortifier, specially formulated to enhance the performance of concrete, for increased strength between new existing concrete, mortar, or plaster, just brush it on to increase bond 8 to 10 times, use as a bond coat or admix, also used to greatly increase adhesion impact strength, abrasion resistance resistance to freeze thaw damage. Features Use in combination with cementious concrete repair materials to improve bond of new concrete to old concrete. Improves bond strength to existing concrete Improves resistance to water penetration Increases adhesion, impact strength and abrasion resistance USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.