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| Cracked coco fix http://www.luthiersforum.com/forum/viewtopic.php?f=10101&t=49765 |
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| Author: | fingerstyle1978 [ Thu Sep 28, 2017 3:56 pm ] |
| Post subject: | Cracked coco fix |
What’s the best way to repair and stabilize a crack like this? I have a coco commission and the guy wants me to build what I would build for myself. Figured I’d build myself one too at the same time since I probably will end up hiding it and making excuses for months not wanting to part with it lol. Just kidding of course but before I start on mine I need to get this fixed so that it doesn’t show under finish.  Sent from my iPhone using Tapatalk |
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| Author: | johnparchem [ Thu Sep 28, 2017 4:02 pm ] |
| Post subject: | Re: Cracked coco fix |
I had some cracks on the cocobolo I am using right on the dark lines like that. Mine was not open and I used thin CA glue to stabilize the crack. |
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| Author: | ernie [ Thu Sep 28, 2017 4:34 pm ] |
| Post subject: | Re: Cracked coco fix |
I would use thin ca and hit it fast with 180 grit paper to blend in the crack with fine sawdust |
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| Author: | Clay S. [ Thu Sep 28, 2017 6:24 pm ] |
| Post subject: | Re: Cracked coco fix |
After gluing it you might want to put a couple of small cleats on it. |
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| Author: | Colin North [ Fri Sep 29, 2017 5:44 am ] |
| Post subject: | Re: Cracked coco fix |
Thin CA and 180 grit worked for me. No trace under finish. |
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| Author: | fingerstyle1978 [ Fri Sep 29, 2017 9:35 am ] |
| Post subject: | Re: Cracked coco fix |
I've hit it with CA glue and sandpaper 4-5 times and I can still see through it. Seems stable though, it might have already been filled with Epoxy. Either way I'm going to go ahead and build with it. The pin holes filled up nicely. |
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| Author: | Corky Long [ Fri Sep 29, 2017 11:22 am ] |
| Post subject: | Re: Cracked coco fix |
Is that a side? I agree with all the CA comments - works great for fixing cracks in hardwood, but I have zero experience in bending a side after fixing a crack like that. I don't know how you'd bend a side after gluing a crack like that.... My 2 cents. |
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| Author: | Rodger Knox [ Fri Sep 29, 2017 11:48 am ] |
| Post subject: | Re: Cracked coco fix |
Corky Long wrote: I don't know how you'd bend a side after gluing a crack like that.... Very carefully... 
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| Author: | wbergman [ Fri Sep 29, 2017 12:16 pm ] |
| Post subject: | Re: Cracked coco fix |
I have seen other posts referring to coco as Mexican crack wood. Seems to me it is crying to be laminated. |
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| Author: | fingerstyle1978 [ Fri Sep 29, 2017 12:44 pm ] |
| Post subject: | Re: Cracked coco fix |
Corky Long wrote: Is that a side? I agree with all the CA comments - works great for fixing cracks in hardwood, but I have zero experience in bending a side after fixing a crack like that. I don't know how you'd bend a side after gluing a crack like that.... My 2 cents. No it's a back, I just trimmed it to fit my mold and get material for the matching rosette. The sides seem fine but I do think some finger braces are in order if not a lamination. My last laminate sides didn't turn out so well so I built a new mold that should fix the problem. I suppose it's a good time to give it a whirl. |
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| Author: | Pmaj7 [ Fri Sep 29, 2017 2:44 pm ] |
| Post subject: | Re: Cracked coco fix |
wbergman wrote: I have seen other posts referring to coco as Mexican crack wood. Seems to me it is crying to be laminated. That would be ziricote. Cocobolo is the Mexican nasty dust wood.
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| Author: | fingerstyle1978 [ Fri Sep 29, 2017 4:16 pm ] |
| Post subject: | Re: Cracked coco fix |
pat macaluso wrote: wbergman wrote: I have seen other posts referring to coco as Mexican crack wood. Seems to me it is crying to be laminated. That would be ziricote. Cocobolo is the Mexican nasty dust wood.Hey now- true it's the nasty dust- but arguably unequaled in beauty and it taps pretty good too. Kinda like would I bang (insert latest pop culture hot chick's name here) if you knew you'd get gonorrhea? Sure I would, I can get over that with a visit to the doc. But herpes? Nah. Is there a herpes of wood though? I sure hope not! |
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| Author: | bcombs510 [ Fri Sep 29, 2017 4:27 pm ] |
| Post subject: | Re: Cracked coco fix |
pat macaluso wrote: wbergman wrote: I have seen other posts referring to coco as Mexican crack wood. Seems to me it is crying to be laminated. That would be ziricote. Cocobolo is the Mexican nasty dust wood.Good to know because I have one of each in the hopper.  Sent from my iPhone using Tapatalk |
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| Author: | Joe Beaver [ Fri Sep 29, 2017 4:30 pm ] |
| Post subject: | Re: Cracked coco fix |
The best bet now is use ca solvent and compressed air to clear the fix out. Then work coco sanding dust into the crack, work it in tight, followed by thin ca and more dust. That should do it |
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| Author: | bobgramann [ Sat Sep 30, 2017 2:33 pm ] |
| Post subject: | Re: Cracked coco fix |
In the long run, it might be good to make that crack structurally sound. I would put a spline of matching wood in it. I would make the crack into a V-shaped groove and fit a matching splinter into it. Then I would glue the splinter in with hot hide glue. If you work from the inside and make it structurally sound, you can then use the CA and dust fill on the outside so it will disappear. Or, you could do CA and dust fill with cleats on the inside, but someone will be able to see the cleats. |
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| Author: | gxs [ Sun Oct 01, 2017 11:28 am ] |
| Post subject: | Re: Cracked coco fix |
bcombs510 wrote: pat macaluso wrote: wbergman wrote: I have seen other posts referring to coco as Mexican crack wood. Seems to me it is crying to be laminated. That would be ziricote. Cocobolo is the Mexican nasty dust wood.Good to know because I have one of each in the hopper. Sent from my iPhone using Tapatalk GS Sent from my SM-G950U1 using Tapatalk |
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| Author: | Elman Concepcion [ Sun Oct 01, 2017 2:21 pm ] |
| Post subject: | Re: Cracked coco fix |
fingerstyle1978 wrote: I've hit it with CA glue and sandpaper 4-5 times and I can still see through it. Seems stable though, it might have already been filled with Epoxy. Either way I'm going to go ahead and build with it. The pin holes filled up nicely. I think I'm a bit late on this. But I would have humidified the plate till the cracked closed and then use CA or Hide Glue. And then cleat it underneath. |
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| Author: | Elman Concepcion [ Sun Oct 01, 2017 2:35 pm ] |
| Post subject: | Re: Cracked coco fix |
[/quote]I think this is well known, but be careful with the Coco dust. I used it for a bridge plate and just the little dust that kicked up left me with a rash on all exposed skin (glad I used a mask). My hands swelled up like I had arthritis for over a week. I am thinking about using what I have left for laminated braces, but think I should invest in a hazmat suit first. I can't imagine what would happen if I inhaled it. My experience may be more extreme than most, but please be careful. GS [/quote] Me too - I'm extremely allergic to cocobolo. I don't touch the stuff. |
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| Author: | Clay S. [ Sun Oct 01, 2017 6:34 pm ] |
| Post subject: | Re: Cracked coco fix |
Ziricote - Mexican crack wood Cocobolo - Poison ivy wood |
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| Author: | bcombs510 [ Mon Oct 02, 2017 4:46 pm ] |
| Post subject: | Re: Cracked coco fix |
So far I haven't had any issues with it. I'm thicknessed the back and sides and will be bending this week so hopefully I'm immune.
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| Author: | Ken Lewis [ Mon Oct 02, 2017 5:47 pm ] |
| Post subject: | Re: Cracked coco fix |
Brad, probably not immune, just haven't developed a sensitivity to it yet. 
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| Author: | Pat Foster [ Tue Oct 03, 2017 1:13 pm ] |
| Post subject: | Re: Cracked coco fix |
Late too. I'd go with what Bob Gramann said. That crack looks to me like what ziricote is known for. The wood shrank--not necessarily from humidity issues--because that's what these woods do as they age, especially if it's figured. Happens with Brazilian too, just a spontaneous crack. It helps to have well-aged wood that's not from stumps. Humidifying it would probably have little to no short term effect, and less for the long term. Pat |
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| Author: | Rodger Knox [ Tue Oct 03, 2017 5:16 pm ] |
| Post subject: | Re: Cracked coco fix |
bcombs510 wrote: So far I haven't had any issues with it. I'm thicknessed the back and sides and will be bending this week so hopefully I'm immune. Cocobolo is a sensitizer. More exposure increases your sensitivity, I don't think anyone is immune. I can still use it, but I have to minimize contact, especially with the dust. It is similar to Pao Ferro (aka morado, bolivian rosewood), which didn't bother me at all the first time I used it. Now I can't use it at all, I don't even have any scraps in the shop. |
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