My original idea when making Sq'Ukes was to leave them unfinished and let the natural patina develop. Unfortunately, I've noticed that my most played Sq'Uke is showing oil marks on the fret board where I touch the fret board most, so on my latest build, I'm trying to coat it with Superglue. Many people in the woodworking community have found that superglue makes a great finish. Many, however, use several coats (5-7), sanding between coats. I'm concerned that too many coats will cause the resonant properties of the soundboard to change. So, I'll start with one.
The process is pretty simple. MAKE SURE YOU WEAR GLOVES as Superglue can glue you skin together. I use nitrile gloves, but I'm sure other material will work. Squirt a little Superglue on the wood then spread it around with your gloved finger. You can also squirt a little Superglue onto your finger for harder to reach places. You will know if you have enough as the colour of the wood will darken.
I think that finishing a Sq'Uke with Superglue will give it a little protection. I'll post again once it is strung up and tested, but so far, its looking good.
I've been making ukuleles for almost a year now. I've garnered inspiration from all over the internet and thought it was time to give back. From everything I've read, the hardest thing about building a stringed instrument (guitar, violin, ukulele) is thicknessing the top. Although I've done that in some of my earlier builds, I wanted to find an easier more efficient way of building. Supposedly, we are running out of good tone wood and that will mean instruments will become mroe expensive. Thicknessing a soundboard is inherently wasteful as you need to take a thick piece of wood and remove almost half of it. Not to mention the cutting and the size of the saw blade.