Share 'Question about Foam'

Hi Everyone, I’d like to ask a question? I'm looking at a lot of your puppets and I noticed that some of the puppets are not covered in material, the foam is painted. Does painted foam last long? How old are some of your puppets that are painted (no material)? And if you sculpt foam what kind of tools do you use just to cut the foam. I have used many tools, razor blades, carving knives, scissor...