In the first part of this work [1], the components of the sulfur cure system were examined to optimize compression set and high temperature aging for sealing applications. The present work extends the trends observed in the first part by eliminating elemental sulfur and 2-mercaptobenzothiazole (MBT), in order to further improve compression set and high temperature aging. In addition, examples of various types of antidegradants were screened, including carbon radical traps, alkoxy radical traps, peroxide decomposers and antioxidant synergists, to determine their effect on compression set and high temperature aging.