Belzona 4141 | Magma-Build | Concrete Repair

A lightweight epoxy repair composite for rebuilding damaged vertical and overhead concrete and masonry surfaces. This high-build concrete repair material can be applied up to 12.7 cm (5 inches) thick on vertical surfaces and up to 7.6 cm (3 inches) thick on overhead surfaces without the use of shuttering during cure and only minimal support during the application.

This solvent-free epoxy repair composite is non-porous and does not absorb water or chemicals. It provides excellent carbonation resistance and withstands extreme weather conditions.

Generally, concrete must be left to cure for a minimum of 28 days. Belzona 4141 (Magma-Build) in comparison will achieve a full mechanical cure at 25°C (77°F) within 12 hours, and full chemical cure in 3 days.


Key benefits:

  • Can be tinted to colour match the original masonry surface
  • Can be feather-edged
  • Hi-build application in vertical and overhead locations
  • No shrinkage irrespective of the thickness applied
  • Reduces the requirement for shuttering
  • Excellent chemical resistance against a wide range of chemicals
  • Easy to mix and apply with no specialist tools and can be used in small quantities when required
  • Resistant to environmental attack
  • Reduced health and safety risks as it is solvent-free
  • Excellent bonding to all masonry surfaces including concrete, brick, marble and stone

Applications for Belzona Belzona 4141 (Magma-Build) include:

  • Repair of spalled or damaged concrete areas and weathered stonework, particularly for vertical or overhead applications
  • Window sill, lintel and column repair
  • Repair of damaged overhead areas such as archways and bridges
  • Refurbishment of decorative moldings and other cosmetic repairs

About the Brand:

Belzona specializes in high-performance industrial coatings, repair composites, and maintenance materials, catering to sectors like oil and gas, power, and mining. Their 60+ years in business emphasize durable, easy-to-apply solutions to enhance machinery lifespan, reduce downtime, and cut maintenance costs.


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