RIO-SHIELD I-Component is a urethane based additive designed for use only with RIO-SHIELD methyl-methacrylate (MMA) based primers. I-Component is required with all MMA based primers as it dramatically increases the ability to bond to all substrates. I-Component is an on-site additive, because it reduces the shelf life of MMA based primers significantly. I-Component should be added and mixed with MMA based primers immediately before adding BPO (Powder Hardener). In no case should the use of I-Component be considered a substitute for proper preparation of the substrate. Performing bond tests in several areas of every RIO-SHIELD installation is always necessary.