I just bought a 4 sided paddle strop and have so far pasted 3 sides, leaving the 4th untouched for now because I haven't quite figured out how to store this without risking contamination. I keep it in a plastic bag resting on the unfinished side but that a awkward. I was thinking of attaching a leather thong to the handle and find a place to hang it where the sides don't touch anything. Curious as to how other members store their 4 sided strops to avoid contamination