It depends upon the material's chemical specification of the mount.
Rubber, Nylon, Neoprene, Polyurethane, EPDM... They all respond differently to different types of lubricants; Mineral Oil Derivative, Synthetic Oil Derivative, Silicone Based Grease, Rubber Grease, Vegetable Plant Oil Derivative, Carbon Graphite Powder, Chalk Rock Powder.
Best to always consult a Materials Specification chart to see what substances and exposure times have a Severe Moderate or Minor affect.
For fitting flexible rubber type components baby powder makes life easy; and everything will smell like fresh nappies!
Boot polish works wonders on nylon plastic rubber derivatives; stops them drying out and cracking