Fogging..?
You can.. The fogging spray was meant to be used on a running engine, to protect it during the time it was going to be idle.
If your only shutting down for a week or so, probably would be a waste. It would depend on the amount of humidity and temperatures of your geographical location. Heavy humidity, more fogging; less humidity, less fogging.
Anytime your going to set it up for a month or longer, should be fogged and battery removed and stored in a warm, dry place (ventilated if on a maintainer).