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Royal & Langnickel Essentials – 250ml Acrylic Painting Gloss Medium Creates a glossy finish and increases transparency, sheen and flexibility. Works well on most surfaces and can be used as a non-removeable varnish. Gloss Medium cannot be used with oil paints, but can be diluted with water to achieve your perfect consistency. Mix Gloss Medium with any of our acrylic paint for a glossy finish! Royal & Langnickel Essentials Acrylic Gloss Medium 250ml (8.45 fl oz) Glossy finish, increases transparency, sheen and flexibility Mix Gloss Medium with any acrylic paint for a glossy finish!