Yeah that makes sense, so I expect this CRC stuff to be good for pleo skin, just not as good as Gibbs. Believe me, the second I can get hold of some I will!
In the meantime, I found some chemical resistance sheets for various rubbers and checked every ingredient of the CRC against TPE. According to the sheet, nothing in there can harm it.
In an ideal world I'd wait for Gibbs but it's winter now and putting the heating on will be adding stress to the already fragile skin (he was in his box by a heater when husband put the heating on - only realised when I came home! That can't have helped...)
At this point I think similar is going to have to do or he'll deteriorate into a skeleton while I wait for Gibbs.