GAC ACRYLIC SPECIALTY POLYMERS with below series :
GAC 100 (Product #3910),GAC 200 (Product #3920)
GAC 400 (Product #3940),GAC 500 (Product #3950)
GAC 800 (Product #3980),GAC 900 (Product #3990)
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, levelers, defoamers and surfactants to ensure good film formation.
The consistency of the GAC polymers is very fluid, and thinner than other GOLDEN Mediums. GOLDEN Fluid Acrylics are slightly thicker than the GACs, but will be the color line least changed in viscosity with any addition of a GAC polymer.
Each GAC product represents a unique polymer that offers certain specific attributes. Therefore, each GAC will have its own unique benefits and applications. Refer to the individual product description of each GAC (below) to find the proper medium to use for a particular application.
PRODUCT APPLICATION
Mixing
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.
Spraying
If spray application is desired, blend with GOLDEN Airbrush Medium. Start at 2 parts GAC Medium to 1 part GOLDEN Airbrush Medium. When faster drying is required, replace the Airbrush Medium with GOLDEN High Flow Medium.
Varnishing
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 Colors manufactures two different varnish systems, Polymer Varnish and Mineral Spirit Acrylic (MSA) Varnish 
 
GAC 100: Universal Acrylic Polymer / S.I.D. Blocker / Most Flexible GAC Polymer.
  
This polymer is one of the most universal used in paint manufacturing. Artists who had used "Rhoplex" (a registered trade name) will find that this GAC most closely reflects the properties to which they were accustomed.
  
The most flexible with a moderate level of tack and gloss.
  
Useful for diluting and extending colors, especially when film flexibility and integrity are important characteristics.
  
Wets pigment surfaces well. The most ideal for artists formulating their own paints.
GAC 200: Increases Film Hardness of Acrylic Paints / Increased Non-porous Surface Adhesion.
  
The hardest and least flexible of any Golden Acrylic product. Caution is advised when using this product alone.
  
Used in its pure form, it is limited to applications on rigid supports, as its lack of flexibility may lead to cracking when flexed. When used alone it needs to be applied and left to dry at a minimum temperature of 70F / 21°C.
  
Ideal as an additive to acrylic paints to increase film hardness and reduce dry film tack.
  
Improves adhesion to non-porous surfaces; however some surfaces, such as glass and glazed tile, will not allow for a permanent bond
  
Dries with high gloss and excellent film clarity.
  
Promotes cleaner edges of hard-edge techniques. The harder paint film has less "pull" as the masking tape is removed.
GAC 400: Fabric Stiffener / Rabbitskin Glue Alternative.
  
Dries to a very hard and stiff film.
  
Most useful for priming fabrics (cotton, linen, silk, etc.) when stiffness is desired.
  
Used as a rabbitskin glue alternative when applied directly to raw canvas or linen.
  
Allows sculpting and shaping of draped fabrics.
  
Note: Optional heat settingwill decrease water sensitivity butalso releases low levels of formaldehyde; therefore if choosing to heat setit is recommended that adequate ventilation be provided.
GAC 500: Self Leveling Applications / Hard Yet Flexible / Best Isolation Coat Medium for Spray-Application.
  
Unique balance of film hardness and flexibility.
  
Mix 2 parts GAC 500 to 1 part High Flow Medium to produce a good spraying, fast-drying isolation coat.
  
Beneficial as an additive for acrylic paints for increasing mar resistance and decreasing dry film tack, without disturbing the balance between hardness and flexibility.
  
Useful when working on flexible or rigid supports.
  
Offers a self leveling working quality.
  
Dries to high gloss film with good clarity/transparency.
  
Useful to hard-edge painters to seal masking tape for cleaner edges. Apply over masking tape. Let dry before applying additional paint layer.
GAC 800: Reduced Crazing of Dried Films / Best for Direct Pouring.
  
Most useful as an additive for acrylic paints when pours/puddles are desired. Most acrylics will craze, which is the formation of valleys that run through a pour/puddle nullifying the uniformity of the film. Such crazing is the result of shrinkage forces exerted during the drying process. GAC 800 stands alone in its resistance to such film discontinuity.
  
Dries with good gloss and film flexibility, but with a slight "hazy" quality.
  
Useful as a modifier when adhesion to chalky surfaces is desired.
GAC 900: Increases Launderability of Acrylic Paint.
  
Designed to be used as a modifier for acrylic paints for painting on clothing. See the GOLDEN Acrylics on Fabric Application Information Sheet for more extensive information.
  
Offers a soft, pliable feel and when properly heat-set, provides excellent laundering stability.
  
Blend with GOLDEN Heavy Body, Matte or Fluid Acrylics for brush or screen application.
  
Mix with GOLDEN High Flow Acrylicsfor "Tie-Dye" effects.
  
Note: The heat-setting process will release low levels of formaldehyde; therefore it is recommended that adequate ventilation be provided.
 
There are volume options : 236ml, 473 ml, 946ml, 3780ml.