Koster Repair Mortar Plus is a fast setting, slightly expanding, watertight repair mortar made for use on mineral substrates. Suitable for internal and external repairs, it adheres well to old and new surfaces and can be used as a polymer-modified cement concrete mortar with Koster SB Bonding Emulsion.

  • Fast setting, expanding mortar for watertight repairs and touch ups

  • Excellent adhesion to concrete, brickwork, blockwork and masonry

  • Can be used for positive and negative side waterproofing

  • Suitable for new construction and repair of existing structures

  • Easy, seamless application for horizontal and vertical surfaces

  • Can be used for fillets, patch repairs, filling cracks, blowholes and tie bolt holes

Applications

  • Watertight repairs to concrete, screeds and masonry

  • Detailing at wall/floor junctions exposed to pressurised water

  • Filling blowholes, cracks, tie bolt holes and oversized joints

  • Underfilling machine foundations

  • Waterproofing basements (interior and exterior)

  • Detailing around service penetrations

Availability

25kg bag

Performance

Density: 1.9 kg/l

Pot life once opened: 10–15 minutes

Minimum 6 months shelf life unopened in dry conditions

Installation

Apply to clean, oil- and grease-free substrates; clean tools with water after use; wear protective clothing, gloves and safety goggles