When a cardboard tube of caulk, adhesive, or sealant gets wet, bad things tend to happen. Namely, the water lessens the integrity of the tube and once pressure is applied the tube can split open, creating a giant, sticky mess. To avoid this, wrap any cardboard tube that has become wet with a layer of duct tape. The tape will reinforce the tube and hold everything together. The tube can then be used as normal with no fear of a caulk or sealant explosion.
To see this tip in action, check out the video below: