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 Post subject: Gibson J-100
PostPosted: Sat Nov 07, 2020 1:48 pm 
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Brazilian Rosewood
Brazilian Rosewood
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Joined: Wed Feb 20, 2008 9:12 pm
Posts: 6977
First name: Mike
Last Name: O'Melia
City: Huntsville
State: Alabama
Focus: Build
Status: Semi-pro
Owner of this guitar bought one of mine. He accidentally sat on the Gibson years ago. Local repair shop fixed the cracked diagonal braces by glueing and compressing. No caps. The cracks were glued somehow, no internal bracing for them. Painted again and shot with Nitro. The cracks are back. But braces look good (endoscope). What would u do to fix cracks and make them dissappear? Should I put caps on the repaired braces? I’m thinking a refinish when done.


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 Post subject: Re: Gibson J-100
PostPosted: Sat Nov 07, 2020 5:21 pm 
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Koa
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Joined: Wed Feb 17, 2016 8:54 am
Posts: 854
State: Texas
Country: United States
Focus: Repair
My 2 cents. I'd leave the cracks alone visually. I'd make sure they're cleated where they need to be moreso than anything else.


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 Post subject: Re: Gibson J-100
PostPosted: Sat Nov 07, 2020 5:29 pm 
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Koa
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Joined: Mon Feb 13, 2012 8:49 pm
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First name: peter
Last Name: havriluk
City: granby
State: ct
Zip/Postal Code: 06035
Country: usa
Focus: Build
Status: Amateur
My guess: There's nothing OP could do, or commission to do, externally, that wouldn't devalue the instrument. Professionally installed internal cleats, sure. Anything external, enjoy the history.

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 Post subject: Re: Gibson J-100
PostPosted: Sat Nov 07, 2020 5:39 pm 
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Brazilian Rosewood
Brazilian Rosewood

Joined: Sun Mar 30, 2008 8:20 am
Posts: 5924
For cleating cracks, I think Thompson's method is gaining traction. Barry Daniels can fill you in on the details:

https://www.mimf.com//phpbb/viewtopic.php?f=8&t=6381

Overspraying and refinishing old instruments isn't as popular as it once was.


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 Post subject: Re: Gibson J-100
PostPosted: Sat Nov 07, 2020 5:40 pm 
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Brazilian Rosewood
Brazilian Rosewood
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Joined: Wed Feb 20, 2008 9:12 pm
Posts: 6977
First name: Mike
Last Name: O'Melia
City: Huntsville
State: Alabama
Focus: Build
Status: Semi-pro
I thought I provided enough information to avoid the discussions above. The guitar has already been devalued with a repaint and a refinish. Not sure how much more I could devalue it. Second, the owner wants it. Trust me, the owner knows guitars. He already chose to devalue it with previous repair.

So, let’s put that behind us. I’m looking for advice on closing the cracks. Cleating is a given.


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 Post subject: Re: Gibson J-100
PostPosted: Sat Nov 07, 2020 8:52 pm 
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Cocobolo
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Joined: Fri Apr 13, 2007 12:52 am
Posts: 285
Location: Canada
First name: Cal
Last Name: Maier
City: Crossfield
State: AB
Country: Canada
Focus: Build
Status: Professional
Humidify, humidify, humidify to close cracks.

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 Post subject: Re: Gibson J-100
PostPosted: Sat Nov 07, 2020 11:00 pm 
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Brazilian Rosewood
Brazilian Rosewood

Joined: Sun Mar 30, 2008 8:20 am
Posts: 5924
If the wood has dried out you may have to splint some of the larger cracks. Humidification may close them but they may not stay that way when the wood comes back to normal humidification levels.


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 Post subject: Re: Gibson J-100
PostPosted: Mon Nov 09, 2020 12:47 pm 
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Brazilian Rosewood
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Joined: Wed Feb 20, 2008 9:12 pm
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First name: Mike
Last Name: O'Melia
City: Huntsville
State: Alabama
Focus: Build
Status: Semi-pro
The cracks are fine to very fine. I may have to by the air glue gun that stew mac sells. Should I pressure the glue in then humidiy?


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 Post subject: Re: Gibson J-100
PostPosted: Tue Nov 10, 2020 9:12 pm 
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Cocobolo
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Location: Canada
First name: Cal
Last Name: Maier
City: Crossfield
State: AB
Country: Canada
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Status: Professional
You need to close the crack first. It may take a few days to humidify the guitar and get the cracks closed.
Put the guitar in a large clear plastic bag along with a couple of water saturated sponges, don’t let the sponges touch the instrument, you may want to put the sponges in a container with holes in it to keep them from touching the guitar.
I usually just wrap the opening of the bag around the neck and hang it up. Check it regularly and when the cracks look to be closed take it out and rub some hhg into the cracks sometimes it helps to run a bead of distilled water along the crack followed by a bead of hhg, then force the glue into the crack by rubbing across the crack with your finger and apply a bit of pressure along the crack with your other hand. The glue will wick through the crack.
Clean the glue up, apply the cleats, and you should be good.
Alternately because the guitar will receive a new finish you could probably just humidify to close them and then wick some CA glue into the cracks and cleat.
It’s your call really. With a refin I would look at using the CA rather than the hhg I think, but it’s not my repair and I’m only giving you a couple of options.

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These users thanked the author Cal Maier for the post: Mike OMelia (Wed Nov 11, 2020 8:55 am)
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 Post subject: Re: Gibson J-100
PostPosted: Wed Nov 11, 2020 8:56 am 
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Brazilian Rosewood
Brazilian Rosewood
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Joined: Wed Feb 20, 2008 9:12 pm
Posts: 6977
First name: Mike
Last Name: O'Melia
City: Huntsville
State: Alabama
Focus: Build
Status: Semi-pro
Cal, you don't worry about CA staining the spruce? Or is that an end grain problem only?


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 Post subject: Re: Gibson J-100
PostPosted: Wed Nov 11, 2020 9:24 am 
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Cocobolo
Cocobolo
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Joined: Fri Apr 13, 2007 12:52 am
Posts: 285
Location: Canada
First name: Cal
Last Name: Maier
City: Crossfield
State: AB
Country: Canada
Focus: Build
Status: Professional
It’s an endgrain issue. I’ve never experienced staining when I’ve used it to glue cracks. If you like you could do a test on scrap. It’s a good idea to test anything that you haven’t tried before. I will test if I haven’t tried something so I don’t get a surprise result on a customers instrument. This goes for most anything.

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 Post subject: Re: Gibson J-100
PostPosted: Wed Nov 11, 2020 9:53 am 
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Contributing Member
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Joined: Wed Oct 08, 2008 11:36 am
Posts: 7241
Location: Southeast US
City: Lenoir City
State: TN
Zip/Postal Code: 37772
Country: US
Focus: Repair
I've also never had a problem with CA on cracks although I normally use HHG. If there is any crushing or end grain involved then a bit of shellac goes on first.

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Steve Smith
"Music is what feelings sound like"


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