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I put a reply up about roasted maple necks a couple of days ago, when asked the same question as this posting. I would always recommend a finish on roasted maple necks and fingerboards, also on solid rosewood necks. I use the word sticky on my last comment, that's most likely a bit of an overstatement. Basically, what can happen with raw wood, it will seem really smooth but, a little bit of dampness on it (hot sweaty hands) and it will cease to be smooth. What this means in real terms, your playing guitar, hand moves up and down the back of the neck no problem. Then you start sweating a little bit, and you suddenly find your hand doesn't move up the back of the neck so easily. This obviously doesn't happen to everyone, I do not have sweaty hands so I can happily play a raw neck without any real problems. I would doubt if many guitars are sold with raw wood on the neck, there is most likely always some kind of finish on it.
Obviously if you're buying necks for building a partcaster then the roasted maple could well be unfinished. I recommend to all my customers buying roasted maple necks, they should apply an oil finish to the back of the neck. I always apply an oil finish to roasted maple fingerboard's before I fret them. I'm finding I'm selling more roasted maple necks than ever before, they seem to be the in thing at the moment. The Roasted Maple I use is actually European Maple, all the stock I have at the present time is highly rippled (I was going to say flamed but!! ) as per @damm73 neck. Roasted maple is very easy to work, it machines easily, very easy to get a good finish on it. It's a very stable wood, never had a neck bow or twist, and it's got beautiful aroma "Caramel".
Here are some photos of some roasted maple necks I've made recently.
Sorry the LPJ is sold.
This is what raw wood looks like.