Primer for Cementitious Overlays BRICKFORM Triple Seven Bond Coat is an entirely new concept in primers for cementitious materials. It prevents the concrete from absorbing water from the overlay material making it easier to spread and achieve a smooth surface. Also, Triple Seven Bond Coat is a reactive primer, remaining active for at least two hours after it is applied. It reacts and forms a chemical link between the overlay and the substrate. Triple Seven Bond Coat increases the bond strength by creating a more efficient chemical link between the concrete and the overlay.