Unitex® Cembond Substrate Sealer

Unitex® Cembond Substrate Sealer

Apply direct from pail onto absorbing surfaces to correctly seal and bind the surface (more than less is highly recommended). Coverage is 50-60m2  per pail. When touch dry follow with the complete, as specified, Unitex system.

Download the Unitex Render Brochure here.

Download the Unitex Render Usage & Installation Guide here.

Additional Information

Size: 15L pail

Coverage: 50-70m2 (depending on substrate absorbency)

Suitable for: All absorbent masonry surfaces

Apply with: Roller and Spray

Safe Use: Refer to the MSDS (have MSDS hyperlinked and go to the MSDS)

Unitex® Cembond Substrate Sealer is a substrate conditioning treatment and is based on a pure acrylic polymer in a water emulsion specifically formulated for compatibility in the highly alkaline cement environment as a sealer or for cement modification.

Unitex® Cembond Substrate Sealer is applied to porous masonry surfaces to even out and reduce the porosity (absorption) and create a seal for the later applied coats. This ensures improved adhesion between layers, improved durability of later coats, and evenness of the coating system.

Unitex® Cembond Substrate Sealer is supplied in ready-to-use 15L pails.

Approximate coverage per pail is 50-60m2 .

Site Requirements:

  • Provide complete system in-situ sample for Architect and Builder approval
  • Apply only onto clean and dry masonry surfaces
  • Mask up all adjoining surfaces, windows, and non-masonry works
  • Seal into expansion joints
  • Over less absorbent surfaces best applied by medium Nap roller
  • Spray apply over very absorbent surfaces (AAC panel)
  • Must be over coated in all systems

Product Performance and Application

Unitex® Cembond Substrate Sealer is for exterior and interior use and offers resistance to early hydrolysis and rain penetration into the substrate. Unitex® Cembond Substrate Sealer can absorb up to 5mm into very porous surfaces.

Unitex® Cembond Substrate Sealer is compatible with all Unitex® acrylic renders and surface applied coatings.

When applying Unitex® Cembond Substrate Sealer please consider the following:

  • Apply between 100C and 350C ambient temperature
  • Allow 2 hour drying time before top coating in Summer, and 4 hours in Winter
  • Generally 1 coat is required (or more if substrate is not fully sealed)
  • Roller and spray applied
  • Use water if thinning product is required, and in cleaning tools

Slows the drying of the subsequent coat and to be a consideration when rain and cooler conditions is a possibility