The Golden 473ml GAC 200 Film Hardener is the hardest and least flexible of any Golden Acrylic product. It is ideal as an additive to acrylic paints as it will increase its film hardness and reduce dry film track. When it is used in it\'s pure form it\'s applications will be limited to more rigid support as it\'s lack of flexibility will lead it to cracking on anything that can flex and bend. Film Hardener can improve adhesion to non-porous surfaces though some materials like glass and tile will not allow for a strong bond. Once it\'s dried it will have a high gloss finish and excellent film clarity, and the harder paint film gives less pull such as when masking tape is removed making it very useful. - Brand: Golden - Size: 473ml - Hardest film and least flexible of any Golden Acrylic product - Improves adhesion to non-porous surfaces - GAC 200 Film Hardener