Greetings, does anyone know a material that will cleanly pull away from resin but is shape-able on the spot? For example, I had a silicone mold that was open on one side and I wanted to close the gap with some (non sulfur) based clay. Yes, it sort of worked – but getting the clay out of the piece was a real mess. I’ve heard that silly putty might work? Looking for something I can shape with the fingers when needed. Many thanks!