Well, I'm not a complete idiot. The reason I was wondering is that I know it is not common to clear the face of an ebony fretboard. If you don't clear the face but you do clear the side, are you really protecting the wood that much? I could see an argument that oiling would be enough. If I owned a guitar with an ebony fretboard - I probably wouldn't have bothered you guys with this question - I just wanted to see what is considered the "normal" thing to do.
Thanks for the replies.
Dave
I'm sure you're not, and I apologise if you though that was what I was implying! I simply meant you finish the sides of the board for the same reason you finish the rest of the guitar - protection.
The ebony sides could be left unlaquered without any problem to the ebony itself, but ideally you want to seal the gluejoint between the neck and fretboard. As it happens, I do have a padauk neck with RW board, that is unfinshed, just treated with Danish oil, and it's been trouble free - so you could leave the ebony unfinshed, but since there is no advantage the extra time masking and feathering the finish edge between the board and neck would be time wasted. You also run the risk of complicating the finshing process by applying different finshes to two parts in such close proximity.
Basically, it's easier to apply whatever you put on the neck to the sides of the board, and it has no negative effect on the guitar, and some possible possitives. As such, it has become the "normal" approach.