Is there some resin like plastic?

Posted in Custom Workstation

So, this is the question. I have casted succesfully a lot of faces and weapons, but my resin once dry is completely and absolutely rigid; if it bends, it breaks. This is not a problem with some weapons, heads, etc, but it is for hair, fine pointing out details, etc.

So you know some resin that once dry is like normal plastic? (I'am not searching a super rubbery resin, just bendable like ordinary plastic)

Thanks in advance.