[olddog]

I have seen rubber coated rolls experience a type of chemical reaction and a similar liquid show up on the surface.

The heat and air movement when the car is in use most likely allows it to dissipate as fast as it shows up. When you seal it all up for 6 months it allows it to accumulate. Although it is also possible that there is some chemical reaction going on with something due to the bag.

Seriously I would not get any more on my skin.