Googandry? What would we googanologists do if we did not have patients.
The only bad googans are googan girls who can't get in to the backseat without opening the doors on a rainy night.
Now, for your most cogent question gleened from that literary marvel of techno-babel -- Striper Surf.
Leave the eel skin on but if you leave it out in the air it will dry up and become a hard plastic skin. So you have to store it in a wet rag to keep it moist. Short term a cooler or frig is fine but keep the cloth/rag wet. Long term you can freeze it wet, (I think) because I don't remember long term storage of skin plugs. If you are going to do skin plugs in a big way the pickling solution in pork rind jars is good for the spare skins you have ready for future use. I used to do that. Once a skin has been installed, you are committed to care for it so as to not have to rig another subsequent one too soon. There is biology -- read rot -- in a skin plug, much like a rigged eel.
My old uncle, Brad Pramscuttle, kicked out of more Maine lumber camps than Mae West in her youth .... my takin too long with this? -- used to keep everythging in the frigerator, which is why his first wife left after two weeks of marraige, and the combination of precious rigged eels and decaying eel skins had the maggots doing the macerana
next to the provalone. So they do need care.