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CEMIX CEMKEY CONCENTRATE is a water based primer and bonding agent, designed to improve the adhesion of CEMIX products to porous, cementitious substrates.


CEMIX CEMKEY CONCENTRATE can be used on concrete, masonry, screeds and fibrous cement sheeting. It can be used with the subsequent application of CEMIX tile adhesives, floor levellers and floor repairers on substrates as per the manufacturer’s recommendations for these. Suitable for interior use only.


• Can be used as a primer and admixture


Varies according to the substrate condition. Approximately 2m2 per litre of product.


The substrate should be free of dust, grease, wax, oil, dirt, loose plaster, laitance, curing compounds, paint and all other friable materials and contaminants likely to prevent the adhesive bonding. New concrete should be left with a wood float finish and sufficiently aged as per manufacturer’s recommendations. Smooth surfaces on new and old concrete should be scabbled. All substrates should be structurally sound, securely fastened and properly supported to eliminate any movement that may cause cracking. Dampen the substrate with clean water immediately before the application of CEMIX CEMKEY CONCENTRATE.


As a Primer:

Use CEMIX CEMKEY CONCENTRATE undiluted. No mixing required. Can also be diluted with clean water at a ratio of 1:1.

As an Additive:

Refer to the manufacturer’s recommendations for CEMIX product being used.


As a Primer:

1. Stir before use.

2. Apply the undiluted product to the substrate with a brush, roller or sprayer.

Note: Ensure CEMIX CEMKEY CONCENTRATE is tacky before the subsequent application of another CEMIX product.

As an Additive:

Refer to the manufactuer’s recommendations for the CEMIX product being used.


As a Primer:

Drying time depends on the substrate, substrate condition, climate, the type of application and the materials being applied. As a guideline, drying time is approximately 20 minutes.

Supplier Item#

1L - 20826, 5L - 20828

Download the Data Sheet for full information:

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