I just bought a composite acoustics (pre Peavy) and after about a week of playing it noticed a small crack in the neck right at the 12th fret. I have no idea if this was there when I bought it, but I expect it was since I generally treat my guitars with great care--even one that is supposed to be indestructible—and, this thing is so small and unnoticeable that you have to look really hard to see it, so I easily could have missed it for a long time. The only reason I did notice it was that the sun finally came out and hit it through the skylight (I typically play at night). I had to take a lot of pictures of it before I could get some decent ones.
You can make the gap, as small as it is, smaller by pressing up on the back of the neck, so I would not exactly call it stable although the guitar still play plays great. I also have no idea on how a carbon fiber neck is built; it seems like this wouldn’t necessarily be a structural issue since it is not around the neck but along it—at least that is what I am hoping for.
Pictures! (The m&m is for scale; the crack is just about the same as the m&m's diameter--but I don't think the crack showed up in the picture!)
Crawls Backward (when Alarmed): Ca Glue For Chip Fills On Guitar Finishes
If its the lengthwise line I have put in the red box, then its either A) a coating fracture in the top coat - would be gloss or gel coat in a boat) or B) a delamination crack along the length of fibres.
If its A then its not critical and a very thin wicking glue may stabilze it. this is hard to apply without making a mess. Think runny crazy glue or similar. if you can get it to open slightly while applying it and then let it close naturally you'll get reasonably good penetration and it will bond well.
If its B then it was likely caused by high transverse (crossways to the neck and the fibres) pressure at the fret, such as when the fret was put in. Maybe without proper side support on the neck at that point. A thin (runny) epoxy applied much like I describe above may penetrate into the crack enough if you can pull it open slightly . Especially if its a slow set epoxy. THink hours rather than minutes. Then let the crack return to normal and stabilize. while the epoxy sets.
Crack Repair On A Taylor Acoustic Guitar — Silesia Guitars
I don't know what resin base CA used, but its likely still epoxy compatible, Or you can just leave it and watch ti see what happens over the next while. Its unlikely to suddenly just break without significant growth first.
I've done a fair amount of composite work on boats, and I wouldn't be too concerned. On boats we get hairline cracks in the gelcoat or coating over the fiberglass. In those cases we actually open up the cracks to give us a wide enough area to get glue into, so that we can be sure of sealing the crack against water intrusion. Obviously you don't have to worry about that here....but if you did want to seal and reinforce it, I would open up the crack with the end of an Exacto blade or scalpel, and then fill the crack with water thin super glue. After that you could be as fancy as you want in sanding down the glue and buffing out the area. And then just keep an eye on it to be sure it doesn't lengthen.
CA is cyano-acrylate, commonly known as Super Glue. It comes in various viscosities - thin, medium, and thick. Thick is used for filling voids, but the water-thin version is probably best for this hairline crack. You can get it at most hobby stores. It is used extensively in radio controlled airplane building (and repairs, if you fly like I do).
Hairline Cracks At The Neck Pocket
Yup I've been a boat builder for years... and yes the thin CA will do the trick... as the guys say. Its most likely coating rather than structural....
But in either case opening the crack a little and filling with the adhesive of your choice will take care of stabilizing it.If you have a hairline crack in your guitar neck, don’t panic! This is a relatively easy repair that can be done at home with some simple tools and materials. Today, we’re going to take a look at everything you need to do to fix a cracked guitar neck.
If you have an expensive or collectible guitar, don’t try to repair the hairline crack in the guitar neck on your own. Guitars range significantly in value—an antique guitar should never be repaired at home. A professional can repair your guitar in a fashion that doesn’t dramatically reduce its value.
Is This Only A Lacquer Crack Or Will This Become Trouble?
Begin by cleaning the crack with a clean rag to make sure that it is free of any dirt or debris. Then, run the sandpaper along the crack to roughen up the surface and help the glue adhere.
Next, apply a small amount of wood glue to the crack, using just enough to fill it in. You don’t want to use too much glue, as this can cause the repair to be bulky and difficult to sand down later. You also don’t want to use too little, as it will fail to adhere and may gunk up the crack internally.
If you have a clamp, use it to hold the crack together while the glue sets. If you don’t have a clamp, you may want to consider using multiple flat wooden braces instead. Don’t just let the glue set. The sides of the crack will pull apart and you’ll be left with a slightly deformed guitar neck. Clamping the repair also helps the glue set faster by spreading it out into a thinner layer.
How Concerned To Be About Cracks Along The Neck?
Once your guitar is clamped or braced, leave it be for at least 24 hours so that the glue can dry completely.
If desired, when the glue has completely set, you may want to place a damp cloth over the guitar neck and iron it on low heat. The steam from the cloth will help melt the wax paper into the crack so that it’s less visible. Otherwise, you can sand it down with your fine-grit sandpaper, using progressively finer grits until it looks nice and polished.
Now you know how to fix a cracked neck on a guitar. Once your guitar is repaired, you can get back to playing! Keep it in a cool, dry area and avoid exposing it to extreme temperature changes or humidity, as this can cause the wood to crack. With proper care, your guitar should last for many years to come.
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