PREMA Center-Over-Injury Repairs are designed for use in the Crown, Shoulder and Sidewall of Radial Tires. They can be installed by either Chemical (COLD) vulcanization or Heat & Pressure (HOT) methods. For COLD application, install using PREMA Ultra Fast Dry Vulcanizing Cement. NOTE: PR115 is used in place of PR110 in Heavy Duty Applications. PR113 is used in place of PR112 in Heavy Duty Applications. NOTE: Refer to the PREMA Repair Charts for the proper selection of the repair unit. Always fill the injury channel.