Rubber Renue restores old rubber parts that have become hard and lost their tackiness and flexibility. Firstly it causes the rubber part to swell allowing dirt to come out of its pores. Later the solvent dries and the rubber returns to form but tacky again so rollers and platens have their grip back. It is great for returning flexibility to rubber belts as well. This product utilizes strong solvents and is not for general use in home or office. It is intended for use in professional maintenance and repair operations. Use only in well ventilated areas.