Dr. Fixit MPB — Multi-Purpose Polymer Bonding Agent for Concrete & Plaster

Most repair jobs on site fail not because the repair mortar was wrong — but because nothing was done to prepare the surface to actually receive it. Old concrete is smooth, carbonated, and doesn't want to bond with new material. Apply a repair mortar directly onto an unprepared surface and you've essentially stuck new concrete on top of old concrete with nothing holding them together — and within a season, that repair is cracking, delaminating, or falling off entirely. Dr. Fixit MPB is the polymer bonding agent that fixes this problem before it starts — and it's what experienced waterproofing contractors and repair applicators reach for when they want their concrete crack repair to actually last.

MPB is a multi-purpose polymer bonding agent that does two jobs depending on how you use it. Applied as a slurry coat onto the prepared substrate before plastering or repair mortar application, it creates a chemically active bonding bridge between the old surface and the new material — dramatically improving adhesion and eliminating the delamination that happens without it. Used as an additive mixed directly into cement mortars, plaster, or cementitious waterproofing slurries, it improves the flexibility, workability, and long-term durability of the mix itself. Both applications, one product.

It works across a wide range of construction chemical repair and surface preparation scenarios — bonding new plaster to old concrete walls, improving the bond of repair mortars on wall crack repair applications, enhancing adhesion for floor screeds and toppings, and improving the performance of polymer-modified waterproofing coatings. Anywhere old and new concrete or mortar meet, MPB is the construction chemical that makes the connection permanent instead of temporary.

Straightforward to use, genuinely versatile, and backed by Dr. Fixit's trusted waterproofing and repair expertise — MPB is the product that makes every other repair product in your system perform better.