Gripset C-Mastic

Gripset C-Mastic is a high-strength, polymer-modified tile adhesive designed for commercial projects using large-format tiles and stone.
Vendor: Gripset
Availability: In Stock

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Gripset C-Mastic

Vendor: Gripset

Gripset C-Mastic


Vendor: Gripset

Gripset C-Mastic


Gripset C-Mastic is a high-strength, polymer-modified tile adhesive designed for commercial projects using large-format tiles and stone. Its white, non-slump formula, enhanced with advanced polymer technology, provides excellent adhesion for large tiles on both walls and floors, indoors and outdoors.

Uses & Applications

  • Interior and exterior wall and floor tiling
  • Commercial applications with large format tiles and stone
  • Areas requiring non-slump properties for heavy tiles
  • Can be applied directly over Gripset waterproofing membranes (check with Gripset Technical Services for specific details)


  • White colour for aesthetic appeal
  • Non-slump formula ensures tiles stay in place
  • Flexible composition accommodates minor substrate movement
  • Commercial grade adhesive for demanding applications
  • Extended open time for convenient installation
  • Meets C2S1TE classifications for reliable performance
  • Suitable for use on 28-day cured concrete and over 16-hour cured screeds/renders

Suitable Substrates

  • Concrete
  • Masonry renders
  • Screeds
  • Plasterboard linings
  • Fibre cement surfaces
  • Gripset membrane systems

Application Guide

  1. Surface Preparation:
    • Ensure the substrate is structurally sound, smooth, stable, dry, and clean.
    • Repair surface defects, fill voids, and ensure brick/block surfaces are pointed flush and rendered (use Gripset 11Y for concrete/masonry repairs).
    • Remove sharp objects, loose material, contaminants, and residues.
    • Mechanically remove unsound layers and contaminants.
    • Consult Gripset for appropriate primers for different surfaces.
    • Ensure concrete slabs are wood float finished, cured for at least 7 days, and meet the required flatness tolerance.
    • Allow screeds and renders to cure for at least 16 hours before tiling.
    • Fix plasterboard and fibre cement products as per manufacturer's instructions.
    • Prime porous surfaces with Gripset GP primer and non-porous surfaces (e.g., Scyon) with Gripset OP primer.
    • Clean and repair existing tiles, then prime with Gripset OP.
    • Clean Gripset under-tile membranes before applying C-Mastic.
  2. Mixing:
    • Combine a 20kg bag of Gripset C-Mastic with 6 litres of clean water in a clean pail.
    • Mix using an electric stirrer until a consistent, lump-free mixture is achieved.
    • Allow the adhesive to settle for 2-3 minutes, then lightly re-stir before use.
  3. Application:
    • Apply adhesive using a notched trowel (10mm for floor tiles, 6mm for wall tiles).
    • Ensure a bed thickness of 2-10mm, depending on tile type.
    • Press tiles firmly into the adhesive, sliding them at a right angle to the notches.
    • Use the buttering method for tiles with lugs or uneven backings.


  • Not recommended for direct use over timber flooring (consult Gripset for advice).
  • Do not apply in temperatures below 5°C or above 35°C.
  • Avoid letting notched adhesive skin over; bed tiles into wet adhesive for full contact.
  • Open time is approximately 35 minutes, and adjustment time is approximately 60 minutes, but can vary with site conditions.
  • Contains cement products that may include crystalline silica; take precautions to avoid dust inhalation.
  • Product is alkaline, so wear gloves and eye protection.

Additional Information

  • Open time: 30 minutes
  • Adjustment time: 40 minutes
  • Grouting time: 16 hours
  • Ready for light foot traffic: 24 hours
  • Pot life: 2 hours
  • Ready for wet area service: 3-4 days
  • Classification: C2S1TE
  • Coverage: 7m² on floors using a 10mm notch trowel (varies with conditions and tile type)
  • Shelf life: 12 months in unopened packaging
  • Packaging: 20kg bags

QLD Only Products

Please note: This product is only available for delivery within QLD or for pickup in-store. Please contact us directly if you wish to have this product delivered outside of Brisbane. Standard shipping charges will apply.

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