Golden have recently announced a change to GAC 800, it has been replaced by their purpose-built Color Pouring  Mediums in Gloss or Matte.

Mix Fluid or High Flow acrylic paints into Golden Colour Pouring Mediums to create stunning paint pours. Unlike epoxy two-pack pouring resins, Golden's water-borne acrylic Pouring Mediums won't discolour, crack or delaminate over time and will remove exposure to dangerous chemical epoxy fumes.

Mixing instructions: Gently mix 10 parts Colour Pouring Medium with 1 part acrylic colour, allow mixture to sit to eliminate air bubbles. Pour. It's that simple!

Matte Colour Pouring Medium provides a beautiful matte finish. Colours hold their edges when poured wet into wet.

Paintings may need to dry for a few days before moving and tenting is recommended. Do not pour thicker than 1/8" (3mm) or attempt to accelerate drying.

Colour Pouring Medium information sheet - click here

Understanding Pouring Acrylics Techniques (Just Paint)