MBP - Multi-Surface Bonding PrimerMortar Bond Primer (MBP) from Custom Building Products solves the adhesion problem on dense, hard to bond surfaces concrete that's been sealed, power troweled slabs, terrazzo, and other non porous substrates where standard thin set struggles to get mechanical grip. Applied before your setting mortar, MBP creates a bonding bridge that dramatically improves adhesion on surfaces that would otherwise be borderline for direct tile installation. Ready to