I'd say oil your rosewood boards whenever they look pale and dry. Like Tibernius, I do it every string change, just 'cause, but it doesn't need to be too frequently.Seriously - that an annual thing? Just prep for cold temps or arbitrarily once a year?
Colder seasons = dry air = loob that shit up. :jj:I've been using lemon oil, but only when I do the initial "purchase" cleaning or I feel like the rosewood looks dry. I haven't used it yet on the Banshee 7 only because I've only changed the strings once - I'll probably hit it next string change "just because."
But I thought I would ask the follow-up because I didn't know whether the cold temps had anything to do with it.
If the wood gets too dehydrated it can shrink, resulting in fret movement and buckling and all sorts of nasties! So it's definitely more important than just an aesthetic thing I reckon! But only in its extremes, generally it's ok to leave for quite a while.It probably makes very little difference to the guitar, but it looks cool and it's quite therapeutic to do!