Pebeo Vitrail transparent and opaque colours make the art of stained glass easy. Solvent based and air-drying. Apply with a brush to carefully degreased transparent surfaces such as glass, acetate, polyester or plexiglas, and allow to air dry,Completely dry in 10 hours.. The transparent colours are dense and very transparent, and the opaque colours are bright and covering. All colours are intermixable. Solvent based, the colours are strong and have excellent resistance to light and UV rays. Once Vitrail has been applied, the decorated surface will have good hardness and will withstand gentle washing with cold water. Objects decorated with Vitrail colours are intended for decorative purposes only and should not be considered for practical usage.