What can I use to stick on em after they get a couple days old and start getting a little crusty but are still good. What will not rust them? I use to put a little lemon oil on but someone told me that would make em rust. Is this true. Crap you would thimk I would know stuff like this I've been playing forever. I use to go through strings often (breaking them).For some reason I dont break em that much anymore and they last me much longer. What about WD40 or seems I rember something called Fret Ease.