This modeling paste from Winsor & Newton is flexible so it doesn't shrink or crack, it allows you to add dimension and texture to your acrylic paintings. It increases opacity, body and structure and is ideal for carving, sanding and building extreme textures. It can be used to build up depth in layers, and either overpainted when dry or mixed with color. Details: Available in multiple sizes Due to high opacity it may lighten certain colors Matte finish Lightweight and flexible