RE:WD 40 and Fly Lines
HMMM. I had a lengthy conversation last week with Bruce Richards at Scientific Anglers. We were discussing the new AST technology of their lines and he mentioned that dressing the lines wasn't needed, but that if you did and used a good dressing, it would not have any detrimental effect on the lines. He stressed the importance of keeping the lines clean, but added that the new AST technology actually helped the line shed dirt and grime and cuts down on the amount of cleaning you need to do in the first place.