Chroma – Atelier Heavy Gel (Gloss) 250ml – Atelier Traditional Heavy Gel Gloss Medium exaggerates structure and sharpens textural edges of Atelier Interactive Acrylic Paint. It can be used as a very strong adhesive for bonding objects in mixed-media. Atelier Traditional Heavy Gel Gloss Medium can be mixed with Atelier Interactive Acrylic Paint over painted once dry or applied on top of a paint layer for a translucent textural effect.