Over the years I've collected nearly a half a dozen fly lines. I fish the following weights 2 wt, 4 wt, and 6 wt. The reels are a good indicator of the weight. However, telling what fly line from what can be confusing and as I get older I tend to be more forgetful. So what is the best way to keep track of flylines? Should I engrave it onto my $100+ spools?