LJS Masonry Hardener

Penetrates and Chemically Treats Concrete and Masonry 

LJS Masonry Hardener is an aqueous blend of inorganic polymers and penetration additives. It is a ready to used right out the container on all concrete and masonry surfaces. 


  • Reacts with free lime to form stable calcium silicate
  • Strengthens all concrete and masonry 
  • Is compatible with new/old concrete, mortar, stone work and brick masonry 
  • Deposits polymeric silicates in the treated substrates
  • Exhibits UV resistance, durability and chemical stability
  • Eliminates dusting and creates abrasion resistance


LJS Masonry Hardener is designed to be used prior to a repair as a treatment, such as patching,concrete placement plastering, painting, and waterproofing. It will aid with the bonding or penetration of other repair materials and LJS Masonry Sealer. Surface must be clean and dust free during application to prevent surface drying for best results.

Technical Data / Specifications

  • Appearance: Slightly cloudy liquid
  • PH: Approx. 11
  • Density: Approx 9.7lbs per gallon
  • Odor: None
  • Chemistry: Polymer Silicates
  • Solvent System: Aqueous
  • Solids Content: 12-15%
  • VOC Content: Zero

  • Sealer Type: Aqueous resin solution
  • VOC: Zero Gms/liter
  • Coverage: 80 - 100 sq/ft per gallon
  • Penetration: 1/2 -1” or more/ surface porosity
  • Packaging: 5 gallon pails
  • Color: Transparent
  • Shelf Life: 24 months