Si20-MB is a ready to apply, silicate based moisture barrier formulation for rendering concrete impermeable to moisture. Si20-MB acts by reacting with concrete and permanently blocking concrete pores.


3-5 m2/L on new and old concrete


Concrete moisture barrier for impervious floor coverings




Permanently blocks pores, hardens and dust proofs

Key Advantages

  • Moisture barrier for impervious coverings
  • Makes concrete impermeable Densifies and hardens concrete, increasing tensile and compressive strength
  • Solvent and VOC free
  • Environmentally friendly
  • Compatible with most floor covering systems

Concrete Preparation

The surface to be treated should be clean and free of all contaminants. Contaminants may require chemical or mechanical removal for Si20-MB to penetrate the concrete pores and function effectively. Adequate porosity can be assessed by applying water droplets to the surface. If the droplets do not penetrate within 2 minutes then Si20-MB may not function properly and may be ineffective.
The surface can be damp or wet, however Si20-MB should not be applied to a surface that has pools of water. The pools should be removed using a broom or cloth prior to application.
Do not apply Si20-MB if rain is expected within 24 hours of application.
Do not apply if extreme weather conditions are expected.
Do not apply if surface temperatures are above 30 degC or below 5 degC – warm surfaces should be misted to cool prior to application.
Wait a minimum of 24 hours after application of Si20-MB before application of any coverings. The surface should be cleaned to remove any laitance, efflorescence or purged contaminants and visually inspected to confirm as satisfactory (always follow coatings/coverings manufacturers surface requirements). Additional coats of Si20-MB may be required.


Si20-MB is ready to apply and should be mixed well before use. A test prior to application must be performed to assess the suitability of the product. Si20-MB may be applied by pour or using a low-pressure hand sprayer then lightly worked into the surface using a broom or mop type applicator.
Ensure even application over the entire surface to be treated. The surface should be impregnated to saturation point in a single application.
Do not allow pooling of sealer. Pools can be spread out using a soft bristled broom. Excess product must be removed before drying. Si20-MB is alkaline and may damage other surfaces. Any overspray or splashes on adjacent surfaces such as glass, metal or painted surfaces should be immediately wiped clean.
Avoid traffic for at least 24 hours. Equipment clean up can be performed with water.

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