Re: Ebony fretboard cracks????
ebony is a really dry wood. not at all naturally oily like rosewood is. it does need to be kept hydrated...what you use to do it is your choice. i think its one of those endless debate subjects.
+1 on that...
I once cut a piece of ebony from a plank, sent it through the drum sander, put it on the neck, and then I noticed fine surface cracks.
What happens, is that a plank of ebony will develop "shakes" which are surface cracks. The ebony below the surface is usually fine, but it looks crap..
It could quite possibly be that your board is from the outside of a plank.
The shakes are unsightly at best, and will open up even more, eventually going all through the board.
Not good news, I know, but thats ebony for you. Its a brilliant fretboard timber, but it does need careful selection, initially, and then care with oil.
I use lemon oil, its OK, its an oil. you could use light machine oil, almond oil, canola oil, Mr.Sheen, or good old fashioned Snake Oil.. its all oil.