Keying Agent – Bonding agent

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Masons Keying Agent is used for bonding mortar, plaster, floor toppings, and concrete and renders to brick and concrete masonry without any need to hack the surface to obtain a bond. Can be used on new or old surfaces.


  • Masons Keying Agent can also be added to the mixing water to improve resistance to trace acids and alkali, as well as reducing surface dusting.


  • Can be used for new work or repair work
  • No surface chipping to obtain a bond
  • Will adhere to most sound surfaces
  • Resists trace acids and alkali
  • Faster application of screeds and renders
  • Not suitable when continual water


 Used as a bonding agent: 5m2 – 12m2 per litre. Coverage is dependent on the coarseness and porosity of the existing surface.

MKA005 Masons Keying Agent 5Lt 5Lt
MKA020 Masons Keying Agent 20Lt 20Lt 

Available in-store at:

TRADIES: This product might not necessarily be a stocked item by your merchant however can be ordered in.

MERCHANTS: To enquire about this product or to place an order, please contact your local Mason’s rep >