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A volatile compound with larger molecules will dissipate slower.Modern boosters used by the factory tend to not evaporate that quickly. A trick is to store your blade in a plastic freezer bag. But many of us have not played in a really long time. So frankly, any rubber would do for me. It's going to be quite some time before I will be playing given conditions where I live.
Storing in a freezer bag may slow down the reaction but a vacuum will not help because that will make volatile compounds evaporate faster. It is the air/gas pockets in the sponge that make the sponge springy. That is why we put air in the tires and balls and not sponge or foam.
There was a TT device I have seen for sale where you put the paddle in side a case and pump it up. It would have been a good idea but the air in the sponge bubbles leaks out so fast.
I was at a place in Manchester MI that made 1 and 2 liter plastic bottles. They were tested by filling a few with hydrogen gas then the pressure was monitored over days or weeks. Hydrogen gas is a small molecule that can diffused through plastic much easier than the larger CO2 molecules that are used in soft drinks.