Large group of ingredients typically found in haircare products, but that also are widely used in skincare products, particularly moisturizers. Film-forming agents include PVP, acrylates, acrylamides, and various copolymers. When applied they leave a pliable, cohesive, and continuous covering over the hair or skin. The film has water-binding properties and leaves a smooth feel on skin. Film-forming agents can be weak skin sensitizers, but this almost always depends on the amount used; lower amounts generally are not problematic.