Johnstones Trade
Mordant Solution 5L

£73.98 inc. VAT
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Pre-treatment for interior and exterior galvanised steel surfaces. Etches to the surface, turning it black. Promotes adhesion.
Mordant Solution

In detail

Johnstone's Trade Mordant Solution is a pre-treatment for new or un-weathered galvanised steel surfaces.

Promotes adhesion by etching the surface for subsequent primers and coatings. The chemical reaction turns the surface black. 

  • Suitable for interior or exterior use.
  • Application is by brush or spray with coverage up to 16 sq/m per litre. 
  • Recoatable in 8 hours.

Application Methods
Up to 16sq/m per litre 
VOC level
4-8 hours 

Additional information

Johnstone's Mordant Solution is a pre-treatment for galvanised steel which converts the surface nature to ensure the subsequent adhesion of a wide range of Johnstone's coatings.


Ensure all oil and grease is removed from the surface to be painted by using Johnstone's Cleaner and Degreaser. Allow the surface to dry before application of subsequent coating.


  • Thoroughly work the Mordant Solution into the surface using a brush ensuring all the surface changes colours (blackens).
  • If no initial reaction takes place, then a second application may be required.
  • Rinse with clean water and allow to dry