Mr Hooper said..
How many products can you think of that it's ok to store in a damp, sweaty invironment for long periods of time ? Pretty much none.
It can't hurt to put your board in a wet board bag for a little while but let it out to dry off and breath when you can.
It's not just paint. It's not great for your foot straps or your deck pads. You also may have small dings in your board that you don't know about.
Forget about the big bad board companies trying to cover their arses, It's just not a great idea long term to leave your board like that.
In my case I had the bag open but hadn't removed it from the bag for the reasons you say, let the pads and straps dry etc. . But then also with the inclement weather conditions it wouldn't have helped. It also seemed to occur where the board was sitting on the rack.
I never would have expected this product that is made to be wet would suffer like this from being wet. Live and learn