{"product_id":"golden-gac-100-acrylic-fluid-medium-16-fl-oz-extends-paint-improves-flow-film-strength","title":"GOLDEN GAC 100 Acrylic Fluid Medium, 473 ml — Extends Paint, Improves Flow \u0026 Film Strength","description":"\u003cp\u003e\u003cstrong\u003eGOLDEN GAC 100 is a versatile acrylic fluid medium that extends acrylic paint while improving flow, control, and protection for supports.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eGAC 100 is part of GOLDEN's line of acrylic fluid mediums and additives designed to expand what acrylics can do without changing their inherent film strength. Use it to thin colour for glazes, improve leveling for smooth passages, reduce the amount of binder needed for more intense pigment, or to pre-seal absorbent supports to reduce discoloration. Made in the USA by GOLDEN, this formula gives professional artists a predictable tool for adjusting viscosity, sheen, transparency, and dry behavior.\u003c\/p\u003e\n\n\u003ch3\u003eHow does GAC 100 change the way acrylic paint behaves?\u003c\/h3\u003e\n\n\u003cp\u003eGAC 100 acts as a polymer extender that thins paint without weakening the acrylic matrix, preserving adhesion and film integrity while increasing flow. It allows you to make washes and translucent layers that sit smoothly on the surface, and it reduces the amount of binder needed, which can intensify colour when desired.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eThins paint for transparent glazes and smooth spreads\u003c\/li\u003e\n  \u003cli\u003eImproves flow and leveling for fewer brush marks\u003c\/li\u003e\n  \u003cli\u003eMaintains film strength and adhesion when used in recommended ratios\u003c\/li\u003e\n  \u003cli\u003eCan increase colour density by reducing binder concentration\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCan I use GAC 100 to protect or prime supports?\u003c\/h3\u003e\n\n\u003cp\u003eYes—applying two coats of GAC 100 to an absorbent support helps reduce Support Induced Discoloration (SID) and limits oil penetration when combining media. It forms a uniform, flexible layer that stabilises porous surfaces and improves the paint’s working properties on panels and papers.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eTwo coats applied directly to supports reduce SID\u003c\/li\u003e\n  \u003cli\u003eCreates an even, less absorbent surface for painting\u003c\/li\u003e\n  \u003cli\u003eHelps block oil migration when using oil-based elements over acrylics\u003c\/li\u003e\n  \u003cli\u003eDries to a clear, flexible film compatible with acrylic systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow should I mix and apply GAC 100 with acrylic colours?\u003c\/h3\u003e\n\n\u003cp\u003eGAC 100 mixes readily with acrylic paint; start with small ratios and increase to find the working properties you want. For transparent glazes use higher GAC 100 ratios, while for bodying or slight thinning use smaller amounts. Always test mixes and allow layers to fully dry before varnishing or overpainting.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eStir gently before use for uniform consistency\u003c\/li\u003e\n  \u003cli\u003eAdjust ratio depending on transparency and flow required\u003c\/li\u003e\n  \u003cli\u003eAllow each layer to dry completely between coats\u003c\/li\u003e\n  \u003cli\u003eFollow GOLDEN recommendations for maximum extender proportions\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill GAC 100 affect sheen or drying time?\u003c\/h3\u003e\n\n\u003cp\u003eGAC 100 can subtly influence surface sheen and the perceived drying behavior depending on how much is used and the pigments mixed with it. It is formulated to keep drying properties consistent with acrylic systems while offering artists control over final surface characteristics when combined with other GOLDEN mediums.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eMay slightly alter sheen depending on concentration\u003c\/li\u003e\n  \u003cli\u003eWorks predictably within standard acrylic drying windows\u003c\/li\u003e\n  \u003cli\u003eCompatible with other GOLDEN mediums to fine-tune finish and drying\u003c\/li\u003e\n  \u003cli\u003eDoes not compromise long-term film durability when used correctly\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho this is for: GOLDEN GAC 100 is aimed at professional and advanced hobbyist painters who want precise control over acrylic paint behavior—artists working in glazing, mixed media, panel and paper supports, and anyone needing a dependable, high-quality extender. If you want to improve flow, protect absorbent supports, or intensify colour without sacrificing film performance, GAC 100 is a practical studio tool.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I mix GAC 100 with any acrylic colour?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes, GAC 100 mixes with acrylic paints; test ratios first to achieve desired transparency and flow.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does GAC 100 prevent support induced discoloration?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Applying two coats to absorbent supports reduces SID and helps block oil penetration.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"GOLDEN","offers":[{"title":"Default Title","offer_id":55294506041681,"sku":"B001YJPX58","price":42.97,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1086\/5567\/3681\/files\/golden-gac-100-front-label.jpg?v=1791931597","url":"https:\/\/craftiche.co.uk\/products\/golden-gac-100-acrylic-fluid-medium-16-fl-oz-extends-paint-improves-flow-film-strength","provider":"Craftiche","version":"1.0","type":"link"}