I've used Tung Oil, but it was pre-thinned.
https://www.realmilkpaint.com/shop/oils/half-and-half/
Real Milk Paint Co. only recommends using un-thinned Tung oil for project like rough timber and concrete. Most other projects, they suggest a 1:1 oil/thinner blend, and denser woods they recommend a 1:2 oil/thinner blend.
It worked well for what I used it on - a poplar body. It was an easy finish to apply that made for a nice matte finish which I finished off with a little carnuba wax.
As for the neck, I'm not sure if Canary is considered to be a "dense hardwood" or not. The Warmoth website likens it to Maple, but I'm not sure how that corresponds to Janka rating, or if Janka rating necessarily relates to how well a wood will absorb oil. Hopefully someone more knowledgeable will chime in. Since this
is the Unofficial Warmoth board, I expect a bunch of people to suggest that you burnish it, or just leave it raw.
Here's the post where I highlight the process. It's really wordy (why did I write so much?), so I pasted the "What I Learned" highlights below the link.
http://www.unofficialwarmoth.com/index.php?topic=29635.msg418571#msg418571
Tung oil cures very slowly, so when it's important to make a distinction between 'applications' and 'coats.' When applying a coat, apply until it stops soaking into the wood, and starts to puddle on the surface. Leave it for 30-40 minutes, and see if it's still puddled. If not, add another coat, and repeat. I probably would stop after 3 coats in a day (wiping off any excess 30-40 minutes after the last application), and just let it absorb, start to polymerize, and let the Pine Oil evaporate. That whole process is what I would call an application, and I'd give at least a few days, more likely a week between them. I'd probably do this minimum 3, maximum 6 times, depending on how thirsty the wood is. If the first coat of a new application isn't absorbing most (maybe 80% or so) of the oil, you're done, and you just have to wait for it to fully cure - at least 10 days, but no longer than 30.
It's going to have a weird smell for a
while - not terrible strong or offensive, just weird. Eventually, it will go away. Incidentally, it makes a good cat repellant. I used it to finish a shelf I built for my cats so they could look out the window - they refused to touch it for months because they hated the smell so much!
