INSTA-FLEX+ clear rubber toughened that can be used in applications where you do not want the adhesive to be seen. INSTA-FLEX has superior to standard CA's. When esthetics are important and a flexible bond is required, INSTA-FLEX+ is your best choice. It forms superior bonds to soft urethane and vinyl plastics. Both INSTA-FLEX and INSTA-FLEX+ work well when bonding R/C car tires. When a joint has a larger than normal gap, flexible CA's provide superior shock resistant bonds.