I’m just getting back into fly fishing after a 20 year hiatus. Anyway, I am looking for a way to mark my reel spools in order to know what spool is spooled up with what. I have roughly 20 different reels right now all with different lines on them and for them life of me I cannot remember what goes with what. I have a couple of spools with stickers on them from the line box but they don’t seem to last. The only one I can remember is the Ross Colorado that I purchased with my first ever fly rod, a Sage RPL+. So it looks like I will be replacing a lot of lines on my reels just so I know what is what. Being that the fly lines are 20+ years old they probably need replacement anyways. However, I’m looking for suggestions on how to prevent this in the future. I do have a fiber laser that I could engrave the spools with and that may be a good solution but it is very permanent.