Shelf Life...Not to be confused with Pot Life.
Shelf Life is the term given for the basic maximum time a product can sit on the shelf before its no longer any good. I also include "opened". Once you open it and expose it to air.
One way I extend the shelf life of the resins and silicones is to never wipe the bottles. Then when they dry, they act as a seal. This does of course make it difficult to open the bottle later, but nothing a pocket knife and a monkey wrench can fix.
The tighter the seal when you close your bottles, the longer they will last.