Adhesives are made with a glue compound that bonds or stick items together. They are made with either natural or synthetic materials. Adhesives come in many forms such as tape, rubber cement, and sprays. Some, like rubber cement and certain tape, can be removed gently without damaging the work. Others may have a stronger adhesive, making it harder to remove, thus making it permanent. Most modern adhesives dry fast and adheres objects quite easily. Others may require a longer dry time.