Sale GAC 400: Acrylic Polymer Fabric Stiffener (237ml)

Golden GAC 400: Acrylic Polymer Fabric Stiffener (237ml)

  • Acrylic painting medium
  • Dries to a very hard and stiff film
  • Most useful for priming fabrics
  • An alternative to rabbit skin glue
  • Made in the USA

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GAC 400: Acrylic Polymer Fabric Stiffener dries to a very hard and stiff film. It is most useful for priming fabrics (cotton, linen, silk, etc.) when stiffness is desired. It can also be used as a rabbit skin glue alternative when applied directly to raw canvas or linen.

GAC 400 also allows for the sculpting and shaping of draped fabrics. Optional heat setting will decrease water sensitivity but also releases low levels of formaldehyde; therefore if choosing to heat set GAC 400 it is recommended that adequate ventilation be provided.

About GAC Acrylic Polymers

GACs can be blended with Golden Acrylic Paints to extend the paint, regulate transparency, create glazes, increase gloss, reduce viscosity or improve adhesion and film integrity. The GAC polymers can also be used for binding pigment solids for various effects and surfaces. Unlike the other Golden Mediums and Gels, GAC Acrylic Polymers have only a minimum amount of thickeners, levellers, defoamers and surfactants to ensure good film formation.

The consistency of the GAC polymers is very fluid, and thinner than other Golden Mediums. Each GAC product represents a unique polymer that offers certain specific attributes. Therefore, each GAC will have its own unique benefits and applications.


GAC polymers should be gently stirred or rocked back and forth prior to use, but should never be shaken, as this will incorporate significant amounts of foam which will be very difficult to eliminate. Foam can severely affect the transparency of the film causing an apparent foggy or hazy quality. When applying with a brush, use minimal agitation and force, and do not overwork, as this too will result in foaming.


If spray application is desired, blend with Golden Airbrush Medium. Start at 2 parts GAC Medium to 1 part Airbrush Medium. When faster drying is required, replace the Airbrush Medium with Golden High Flow Medium.


The GAC polymers are intended for use as binders, modifiers or additives for acrylic paints. They are not intended for use as a final varnish. Golden Artist Colours manufactures two different varnish systems, Polymer Varnish and Mineral Spirit Acrylic (MSA) Varnish.

About Golden Mediums

Golden offer the widest range of mediums for acrylic painting. Their range includes gels, additives and effect pastes, which allows you to choose whatever qualities you desire for your acrylic painting: luminous glazes, gritty opaque structures, string effects, glassy areas or variable drying times. This expansive range gives rise to inspiring possibilities that allow you to do very unusual things. Whatever your needs, our Golden range has you covered.

Product Reviews
  • Number of Reviews : 1
  • Average Grade : 5 / 5

  • 20/12/2020
  • 5/5
Does what it says on the packet Tried several ways previously to stiffen my crocheted Christmas baubles and was not happy with the results. One saturation in the GAC400 left them rock hard and ready tor decorating in a few hours. Would recommend.

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