James Lister wrote: ↑
Wed Jul 26, 2017 10:44 am
geoff-bristol wrote: ↑
Tue Jul 25, 2017 11:04 pm
Any oil finish on spruce can be real problem if it absorbs into the wood. It just does not dry well. Seal it with shellac first.
I'd dispute that. I've never had any problems with oil finishes on spruce (apart from some discolouration after a number of years where the player's arm rests on the lower bout, and on the upper bout around the 12th fret, which was easy to recover). It may be true that the oil doesn't dry quickly, but it does dry, and I've never been able to discern any negative effect on tone (in fact most of my best early guitars had oil finishes rather than French polish.)
No pressure, then, James! I tried a thin sealing coat of shellac and the oil is going on nicely. I have previously applied oil without a sealing coat (Danish oil, I think), and it worked up to a nice finish, but it yellowed quite significantly over time. Personally I don't dislike that look, but some people seem to prefer a blond soundboard.