 Composite objects with metal parts, like textiles with metal snaps, are susceptible to corrosion when wet. But you'll want to give immediate attention to any objects with iron parts. That's really a high priority object because it's likely that the iron portions could damage the rest of the object. What you want to try to do with the metal parts is dry them as soon as you can and if you can isolate them, that can help. For example, if you have, say, a canvas with metal rivets on it, don't leave the wet metal rivets up against a wet textile. Try to put some mylar or even, you know, like a cut-up ziplock bag on either side of it so that the metal isn't up against a wet organic material because it will corrode and cause staining on the textile portions.