Winsor & Newton Professional Acrylic Modelling Paste is lightweight and flexible, so it doesn’t shrink or crack and allows artists to build up depth in layers after allowing each layer to dry. It increases opacity, thickens the consistency of the colour, building body & structure and accentuating texture, brush marks and palette knife marks. It is ideal for carving, sanding and creating extreme textures. It can be used to build up depth in layers and either overpainted when dry or mixed with colour. This opaque medium may lighten some colours, and it dries to an even, matte finish.