Painteds do shed their shell scutes in big pieces (the size of the scutes ironically, lol) they also shed their skin, but because they are in the water and it comes off in pieces you don't often see it, or if you do it looks like slime almost. Hope that helps!
~mike
“The richest value of wilderness lie not in the days of Daniel Boone, nor even in the present but rather in the future.” - Aldo Leopold