Chroma - Atelier Fast Fixer/Medium 250ml - Dries fast and waterproof for traditional acrylic techniques. Use with Atelier Interactive and other artists? acrylics. For Atelier Interactive - this medium allows you to paint rapidly. Layers dry fast and resilient allowing quick progression. Use to dilute for thinning paint or on its own to reinforce and isolate a paint layer for scratch back glazing or Varnishishing. For other artists? acrylics use as a fast drying glaze medium. Shake bottle gently before using. Clean up with mild soap and cool water. Water-Based and Non-Toxic.