Cracked Headstock??

Post some pictures.

Depending on the break you might be able to get away with Titebond. I normally use hot hide glue, the stuff they've built instruments with for centuries. It's wicked strong but it's hard to work with. Sometimes it's the only thing that will work.  It cleans up with water, until it sets.  Epoxy holds well but it "creeps" over time (as can Titebond), and squeeze out is nearly impossible to clean up after it hardens.

You'll also need a way to clamp the parts together. That needs to be rehearsed to make sure it will actually work before applying the glue.

This is best.   If you're not comfortable, for any variety of reasons, using hot hide glue, then a good brand of carpenter's glue would probably work.  But you gotta make sure you get it right the first time and you still gotta use strong clamping.

Would never do this with anything on the body, but for the neck, which you want to become a permanent solid piece again, I'd do it.  I have always been amazed at the strength of good ol' carpenter's glue on wood.  It's strength is something like 2000 lbs per square inch or something crazy like that.  Once wood is glued with carpenter's glue, it's so strong that if you try to break it, it will probably break somewhere else that is weaker and not at the glued joint.

My dad built a 3d engraving machine ( which holds a lot of weight and takes a lot of torq ) once out of maple ( these machines were only ever built out of solid steel ) just to prove to his co-workers how strong and stable carpenter's glue and maple can be.  All of them -- all very experienced machinists -- were actually shocked and amazed.

Good luck.  I know I do not have any of the skill and daring required to attempt to fix something like that.  Unless of course, it was on a guitar so cheap it'd be no sweat to throw it away if it didn't work. 

PICTURES!!!! I WANT PICTURES!!!

I sent this post to a friend and he thought epoxy would be better. I agree, but clean up will be much harder. I use paper towels with denatured alcohol on them. Lots of them. It wipes up the squeeze out nicely. Be sure to leave clearance in your clamping for clean up. Any extra epoxy squeeze out that hardens can only be removed by scrapping, then sanding with many grits to blend it with the existing finish.

Thanks for the advice on the glue I'm not sure about the truss rod being exposed on all the surfaces that I got a glue I was thinking covering with a bit of oil so glue doesn't stick or putting some tape for plastic protected but very risky if one day the truss rod becomes an issue for straightening the guitar











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