Special Purpose Mediums – Golden


GAC (short for Golden Artist Colors) Specialty Acrylic Polymers are based on 100% acrylic polymer emulsions. The GACs are useful as mediums or modifiers of acrylic paints. GACs can be used to extend acrylic colours, regulate transparency, create glazes, increase gloss, reduce viscosity or improve adhesion and film integrity. 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 more fluid and thin than other GOLDEN Mediums, so they will reduce the thickness of most GOLDEN Acrylic Paints. GOLDEN Fluid Acrylics are slightly thicker than the GACs but will exhibit less change in viscosity with the addition of a GAC polymer.

Each GAC is a specialised polymer with unique benefits and applications. Refer to the product descriptions to find the proper medium for particular applications.

Available options:

  • GAC 100.
  • GAC 400.
  • GAC 500.
  • GAC 800.
  • GAC 900.

Available in 237ml (all options) and 473ml (GAC 500) bottles.


View our range of Golden products.


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Available Options:


Available options:

GAC 100 is a thin, translucent, gloss medium. Useful for thinning or extending colours as well as increasing flexibility. Transforms solids more readily than other polymers and is useful for creating homemade paints. (Item #3910)

GAC 400 is an acrylic polymer for stiffening fabrics that allows artists to transform lightweight fabrics into freestanding forms. Dries to a hard, stiff film.

GAC 500 Gloss extender for Fluid Acrylic Colors is a unique balance of film hardness and flexibility offering increased levelling, increased mar resistance and decreased dry film tack. GAC 500 is particularly useful for extending Fluid Acrylic Colors with minimal property change. It can be mixed with Airbrush Transparent Extender for a fast-drying, sprayable isolation coat.

GAC 800 reduces crazing in puddles, pours, and other thin, pourable paint applications. “Crazing” is the formation of crevices in surfaces that develop as acrylic paints and mediums dry. The addition of GAC-800 promotes drying with a smooth, even film, good gloss and flexibility, but with moderate clarity. Useful for adhesion to chalky surfaces.

GAC 900 is a heat-set fabric painting and 100% acrylic medium that modifies paints for a softer hand and increased launderability on wearable fabrics. MUST be heat-set.

Additional information


GAC 100 (3910), GAC 500 (3950), GAC 900 (3990), GAC 400 (3940), GAC 800 (3980)

Bottle Size



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