GOLDEN Acrylic Medium GAC-800 946 ml — Low-Crazing Pouring Extender, Glossy Flexible Finish

GOLDEN Acryl Medium GAC-800 is a 32 oz low-crazing extender that improves pour painting by promoting a smooth, flexible, glossy acrylic film with better adhesion to chalky surfaces.

GAC-800 is a fluid acrylic polymer medium designed to extend and modify acrylic paints for pouring and thin application techniques. It reduces the tendency of poured surfaces to develop fine crevices (“crazing”) as they dry while maintaining workable flow and surface sheen. Formulated with minimal additives, this medium balances clarity and flexibility in finished films and helps paints stick to marginal or chalky substrates.

How does GAC-800 reduce crazing in poured acrylics?

GAC-800 modifies the drying characteristics of acrylic paints so the film forms evenly and is less prone to developing hairline crevices. Its formulation encourages slower, more uniform film formation and retains flexibility as the medium cures.

• Use as an extender with colours to improve leveling during drying.
• Helps films remain smooth and cohesive on large poured areas.
• Minimizes surface tension changes that cause cracking or crazing.

Can I use it to improve adhesion on chalky or difficult surfaces?

Yes—GAC-800 enhances paint adhesion to slightly chalky or porous surfaces by forming a more tenacious acrylic film. It’s not an absolute primer replacement for severely degraded substrates, but it helps where standard paint has trouble sticking.

• Apply to mildly powdery or previously painted surfaces to boost grip.
• Works well under thin, portable paint applications and pours.
• Follow surface prep for best results: clean, dry, and remove loose powder.

How will GAC-800 affect colour, gloss, and handling?

GAC-800 produces moderate clarity and preserves a good gloss while keeping the mixture fluid enough for pouring and thin brushing. It has minimal thickeners and defoamers, so it maintains workable flow and levels without overly clearing or dulling pigments.

• Gives a smooth, even film with consistent gloss across poured sections.
• Maintains workable viscosity for cells, blooms, and flow effects.
• Produces a flexible, durable finish after full cure.

How should I use GAC-800 in pouring recipes?

Start by substituting a portion of your pouring medium with GAC-800 and test ratios to suit your paint brand and desired effects. Small sample pours will reveal how much GAC-800 improves leveling and reduces crazing for your technique.

• Mix gradually: add medium to paint until desired flow and transparency are reached.
• Test modest ratios first (for example, 10–30% medium) and adjust based on results.
• Use clean tools and avoid introducing excess air to maintain clarity.

Who this is for: GOLDEN GAC-800 is aimed at artists and makers who pour or apply thin acrylic layers and need better surface integrity and adhesion. It suits painters working on panels, canvases, and mildly chalky substrates who want fewer surface defects, good gloss, and a flexible finish. Ideal for experimentation—test with your paints to dial in the behavior you want before committing to large works.

• Features:
  • Useful for thin - portable paint applications
  • Increases adhesion of paints to chalky surfaces
  • Low crazing extender for pouring acrylic colours
  • Promotes drying with a smooth, even film, good gloss and flexibility
  • 32 oz bottle