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first of all, detune the guitar. If there,s something open, glue can enter. If its a cedar neck, I think that Hot hide Glue will be the best. Very thin cyano penetrates better, but I,ve been told that there,s an issue with cyano and cedar
It is Spanish cedar. I'll order some hide glue. Should I just paint it over , let it settle / dry and then rub excess off with alcohol? And what would be a good method of heating up and applying it?
This interesting for me as I have something similar with my No1......which I took to Utrera a few months after building. Extreme heat and a flaw in the wood have caused the neck angle to change and now I notice a crack.......so this gives me an avenue to walk down. Sorry, did'nt want to hijack the thread, but it's a good starting point for a fix. Best of luck with this Vigrond and to you Anders for the tip.
I wrote HOT hide glue. The kind you mix yourself and heat. The ready to use cold stuff wont make a good repair.
The best would be to leave it with a pro. This is a serious place to have a crack and the pro will know how thin to make the glue. The thinner, the better it penetrates but a thicker mix will make a stronger bond, so its a compromise, and experience helps a lot in these issues.
Don't mess around with this, take it to a pro. It's a very dangerous place to have a crack. It might be less likely with that type of cutaway but this is the kind of crack that can go straight through the heel block and crack the sides as well. Definitely detune and go to a luthier, it shouldn't be too difficult at this point.
I recently repaired a fine Spanish classical guitar for a woman who uses it at an elementary school. She left it leaning against a wall and some kids knocked it over. It split like this one, right through the heel--but also through the foot and through the upper bouts of the sides! Best to keep them in the case when not being played.
My repair? It was an early Antonio Marin Montero of Brazillian rosewood. At first I thought I would have to drill a hole through the heel so I could inject glue with a syringe, but when I got the strings off I found that the crack went all the way through and the pieces of the heel/foot separated easily. So I put yellow glue in there and clamped it. Then I used many small cleats to repair the sides. All this took just a couple of hours. After I french polished the sides a little the customer couldn't tell the repair was there, but this was a pretty battered guitar. A shame. It had a very nice sound. I was a little disgruntled that someone would treat a good guitar so carelessly.