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Fasterthanlight
 Post subject: Superglue Yellowing
PostPosted: Wed Jun 22, 2016 12:38 pm 
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Cocobolo
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Joined: Wed May 04, 2016 4:17 am
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First name: Gary
Last Name: Leddington
Focus: Build
Status: Amateur
Hi Folks.

After gluing in a rosette a couple of weeks back its seems that some areas a round the inlays have yellowed a bit, i presume from the superglue i used.

I used cheap glue, i guess this is the main problem, but does anyone know any fixes for this other than the obvious of using better quality glue?

G.

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bcombs510
 Post subject: Re: Superglue Yellowing
PostPosted: Wed Jun 22, 2016 12:58 pm 
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Brazilian Rosewood
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First name: Brad
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Is it the rosette or the soundboard that is discolored? Did you seal the rosette channel before gluing it in?


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StevenWheeler
 Post subject: Re: Superglue Yellowing
PostPosted: Wed Jun 22, 2016 1:00 pm 
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Gary,

Spruce must be sealed with shellac prior to the application of CA adhesives. I've also seen the same yellow staining on soft maple and similar problems with cedar so I seal all light colored woods before applying super glue.

Steve
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meddlingfool
 Post subject: Re: Superglue Yellowing
PostPosted: Wed Jun 22, 2016 1:33 pm 
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Brazilian Rosewood
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I think they've got it. Sounds like superglue wicked into the end grain of the unsealed rosette channel. Get yourself a bag of dewaxed shellac flake and make shellac as required...
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Fasterthanlight
 Post subject: Re: Superglue Yellowing
PostPosted: Wed Jun 22, 2016 2:32 pm 
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Cocobolo
Cocobolo

Joined: Wed May 04, 2016 4:17 am
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First name: Gary
Last Name: Leddington
Focus: Build
Status: Amateur
Well thanks for the replies guys.. and duly noted regarding the shellac.

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Clay S.
 Post subject: Re: Superglue Yellowing
PostPosted: Wed Jun 22, 2016 3:42 pm 
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Brazilian Rosewood
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I used some cheap Chinese super glue from Walmart that yellowed after a few weeks. [headinwall] It didn't work out to be a good way to cut costs. The glue penetrated deep into the fibers of the wood and could not be sanded out. I wound up doing a sunburst finish to hide the stains.
You might be able tostain the top a matching yellow and do a tobacco sunburst.
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bluescreek
 Post subject: Re: Superglue Yellowing
PostPosted: Wed Jun 22, 2016 6:17 pm 
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Brazilian Rosewood
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I do not use CA on spruce
Duco for all my rosettes. The first few guitars I used CA all yellowed .

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wbergman
 Post subject: Re: Superglue Yellowing
PostPosted: Wed Jun 22, 2016 6:26 pm 
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Koa
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Posts: 1582
Location: United States
I can actually detect discoloration on a CA seam in BRW.
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kencierp
 Post subject: Re: Superglue Yellowing
PostPosted: Wed Jun 22, 2016 9:59 pm 
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Koa
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Joined: Sat May 19, 2007 11:03 am
Posts: 1737
Location: Litchfield MI
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Like the Taylor factory we use clear nitro lacquer to seal the rosette and binding channels if CA is going to be used for assembly.

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