Seems unlikely that you’d have a reliable source of paint for 1000 years, which might be the limiting factor. But there’s always some rate of chain scission, e

Seems unlikely that you’d have a reliable source of paint for 1000 years, which might be the limiting factor. But there’s always some rate of chain scission, even in the absence of UV/water/whatever. I just have no idea whether that has a meaningful impact on material properties over 1000 years.