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Matisse Acrylic Thickener MM38


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Use Matisse Acrylic Thickener MM38 as an alternative to adding gels and other impasto or building mediums to acrylic paint which work by imparting their own thicker bulk to a paint mix. 

This medium chemically thickens the paint. It is a rheology modifier, that is, it changes the flow and viscosity of the paint, without losing any colour. You may notice a reduced sheen in some colours once dried film which can be adjusted with varnish once dry. 

Application / Use
  • Add a few drops to acrylic paint and work it into the paint with a pallet knife.

  • Continue to work the paint with the pallet knife until you see the paint thicken.

  • If you don't see results straight away keep working the paint it will thicken, patience is the key here.

  • Use within 24 hours of mixing in - 

*Use 2-3 % to your paint - any more than 5-7% (depending on the original viscosity) will not continue to thicken the paint but possibly start to thin it down again. 


Each Matisse paint colour will require a different amount to be added to reach the same consistency. Different colours may require differing amounts of the medium. Compatible with all Matisse acrylic colours. 

Drying Time

The thickness of the application of this product will determine the length of drying time. For a thin coat, a standard estimation is 48hrs, but prevailing atmospheric conditions upon application will influence drying time (humidity, heat, cold, etc.). 

*WARNING do not force dry or use in temperatures above 30℃ as premature skinning may occur trapping water in the coating resulting in a milky appearance.


Semi-Gloss to Matt Finish.


Clean brushes, palette knives, jugs and hands with warm, soapy water.