Over two decades have elapsed since the commercial introduction of the first solid dielectric enhancement technology or chemical rejuvenation. During those years, silane injection has proven itself as an important tool to enhance the reliability of aging infrastructure. There are some risks associated with rejuvenation. Some of those risks are shared with replacement. Some risks are unique to injection. This document examines the risks of chemical rejuvenation utilizing the two most widespread commercial injection methods and materials for URD cables.