>>6163522The problem with rubber is that as it gets older, they shrink and dry so it will rot and crack over time even when left stationary/unposed. Transformer and Hot Toys collectors usually have these problems because of tires, parts of the body or accessory is made of it.
Here is a Hot Toys collector's Chris Redfield who he left unposed for a long time only to find out it crack over time.
https://www.youtube.com/watch?v=Y4iEebTp5Pc