Pebeo Studio Acrylics Bindex is a non-yellowing, translucent, acrylic binder with fluid consistency which offers a flexible waterproof film after drying. Bindex is used to prepare acrylic colours. When mixed with the colours it provides an even colour consistency, allows better adhesion, transparency, depth, drying time without thinning the paint. It is ideal for collages and inlays. It's also commonly used in bookmaking and bookbinding.