I masked the soundboard from the UV, trying to keep the light colour of the spruce. I thought it would look a little better if the spruce formed a better contrast with the yew. Of course eventually the spruce will colour but there's not a lot that can be done about that.
This is what I term the 'one day finish' . . . . because it can all be done in a single (but very long) day. I only use this finish for the soundboards, on romantic guitars or when folk prefer it, which isn't very many. I fit in to the 'not very many'. It's similar to what Aram does on his guitars, although I use a different approach and I'm not fond of the Danish or Liberon oils. It relies on sanding to a very high grit. I take it to 800G, some take it even higher. 800 grit is good enough for me. All the sanding is done in deliberate, very straight lines. I then do a quick French polish with very thin shellac, probably 1/2 lb cut. Watery thin. No need to spend very long on the surface, 5 minutes should easily be enough. That's allowed to dry for 30 minutes at which point it's cut back with 800 again to remove the raised grain. Another two sessions of this french polishing is done before it's allowed to dry for a couple of hours. It gives a very slight sheen and seals the surface of the wood. Then I apply Tru Oil, in French polish style and wipe it off, again in very straight lines. I can get 3 or 4 coats of this done in 10 hours or so. I do have the UV cabinet which certainly helps accelerate the drying.
That's it, nothing more to do but let it harden for a couple of weeks. It can then all be buffed with a linen cloth.
It doesn't offer the protection of a full French polished surface but providing you aren't playing flamenco or using some avant garde technique it's a perfectly nice, very silky finish.