Hi Folks, I am wondering about the long-term durability of using 2mm black corrugated polypropylene sheet, (the type that's used for floor protection and can be bought in sheds) as part of a barrier/partition between my lean-to and the next-door neighbour's fence, once fitted it will effectively make the lean-to into a shed, it wont be exposed to direct sunlight as will be below the fence (and clear greenhouse plastic above it) but would it still start degrading even though not in direct sunlight?