Resin Rock Vertical Binder is a high-performance polyurethane based porous aggregate bound system for vertical application, allowing the vertical faces of steps to be coated in bound stone. Vertical Binder, when cured, gives excellent strength and elongation performance and is therefore an exceedingly durable system. Vertical Binder is based on aliphatic polyurethane technology to give enhanced UV performance.

Vertical Binder is used as both the bond coat applied to the vertical surface and the binder used to form the bound stone surface.