Are the Wraps Just Old?

I applied the S-IVB transition wrap this evening. It cracked.

There was a little stress on the wrap, tangentially, in order to keep it tight. The CyA created a few cracks in the forward (small) edge. (Side note: I probably should have just glued this wrap down to the paper transition with canopy glue. I'm using that on the edge joint and on the aft [large] edge: I didn't want to take another chance with this wrap.)

I wonder if these wraps are just a little old. Does the chemistry of the wrap change slightly with age, making them more susceptible to developing these small cracks? I bought the kit about ten years ago.