I'm a D'Addario dealer and I've gotten some EXP's to try out on my own guitars before I stock them. I've yet to put them on any guitars so the jury is still out but I'll proabably be placing another order in a couple of weeks and I'll ask my sales rep about that.
I don't use any string treatments, never have.
I do 'flood' the fingerboard with lemon oil in extreme cases. For instance, tonight I was given a 25 year old Sigma solid top to check out. Now imagine a fingerboard that's NEVER been cleaned or oiled in 25 years.
That's what I see all the time. It's not for the weak stomach.
I will literally pool the lemon oil on the wood and it will actually swell a bit as it absorbs and then stabilizes. I'm also using the oil as a cleaning agent as described in my sticky thread here of how to do that. At least this one doesn't have any mold on it. This one will be lemon oil in a bowl, dip a toothbrush in it and go to town. Then steel wool the frets to polish them, then clean rags to wipe it all down and away. So, for this guitar I'm doing a set up, which is $25 w/a new pack of strings, but I'm including the lemon oil process which I call a 'spa treatment'.
That's an extra $10.
