Durham's Rock Hard Water Putty, 4 lb. is a versatile plastic repair material in powder form that you mix with water to create a durable, rock-hard solution. This putty is designed to harden quickly within 30 minutes and will not shrink, making it i for repairs on walls, floors, furniture, woodwork, or plaster. Its easy-to-use formula can be colored or painted to match your project’s needs, providing a seamless finish every time. Whether you are restoring or repairing, this water putty a reliable and lasting fix. Model Number: RHWP4