Official Luthiers Forum!

Owned and operated by Lance Kragenbrink
It is currently Sat Nov 23, 2024 6:42 pm


All times are UTC - 5 hours





Post new topic Reply to topic  [ 15 posts ] 
Author Message
 Post subject:
PostPosted: Mon Oct 01, 2007 7:50 am 
Offline
Cocobolo
Cocobolo

Joined: Tue Sep 12, 2006 12:43 pm
Posts: 147
Location: United States
Hey folks,

I've just finished buffing and finishing another guitar. I went and bolted on the neck, and the lacq. must have compressed and there is a white (lifted area in pic) along the neck joint. What is the best way to fix this? will applying more lacquer with an artist brush re adhere this? Or, Do I have to sand it down and blend it in? Thanks in advance.




Top
 Profile  
 
 Post subject:
PostPosted: Mon Oct 01, 2007 8:00 am 
Offline
Old Growth Brazilian
Old Growth Brazilian

Joined: Tue Dec 28, 2004 1:56 am
Posts: 10707
Location: United States
was this neck glued in prior to finishing? That lifting sure is reminiscent of glue blockage causing the sealer and finish not to adhere


Top
 Profile  
 
 Post subject:
PostPosted: Mon Oct 01, 2007 8:06 am 
Offline
Cocobolo
Cocobolo

Joined: Tue Sep 12, 2006 12:43 pm
Posts: 147
Location: United States
No Michael, the neck has not been glued at all. It's just bolted on. It was fine until I tightened it down. The Lacq has lifted off causing these light marks.


Top
 Profile  
 
 Post subject:
PostPosted: Mon Oct 01, 2007 8:15 am 
Offline
Old Growth Brazilian
Old Growth Brazilian

Joined: Tue Dec 28, 2004 1:56 am
Posts: 10707
Location: United States
I knew the lacquer had flaked off I was just wondering if maybe glue on the wood might be the culprit for the lack of bonding there.

I would sand or scrape back for a little bit past the problem area and touch up with a brush, maybe 3 coats.

Other than something on you buffer wheel that beat it off. (which if the case would have happened elsewhere as well) something has had to cause the lack of adherence. It even looks as if your sealer is is missing a well.


Top
 Profile  
 
 Post subject:
PostPosted: Mon Oct 01, 2007 8:32 am 
Offline
Cocobolo
Cocobolo

Joined: Tue Sep 12, 2006 12:43 pm
Posts: 147
Location: United States
Terry, where can I get that but. cell. At a hardware or auto paint store? Sounds like it might be the way to go if it's worked for you.


Top
 Profile  
 
 Post subject:
PostPosted: Tue Oct 02, 2007 1:10 am 
Offline
Brazilian Rosewood
Brazilian Rosewood

Joined: Fri Aug 19, 2005 4:02 am
Posts: 3263
Location: The Woodlands, Texas
First name: Barry
Last Name: Daniels
Thin superglue will wick under the lifted lacquer and reattach it. Obviously, you should remove the neck before you attempt this.

Bolting the neck down must have put pressure on the edge of the lacquer to cause this. You might want to sand the leading edge of the lacquer on the inner face of the heel slightly so it doesn't happen again.


Top
 Profile  
 
 Post subject:
PostPosted: Tue Oct 02, 2007 1:16 am 
Offline
Brazilian Rosewood
Brazilian Rosewood

Joined: Fri Aug 19, 2005 4:02 am
Posts: 3263
Location: The Woodlands, Texas
First name: Barry
Last Name: Daniels
One thing further about the superglue application. It needs to be applied at the point where the separation has occurred and you should try to keep it off the surface of the finish to prevent damage. So in this case, apply the CA to the inner face of the heel, along a line about 1/16" back from the edge. Apply enough that it flows over the the edge and wicks into the crack.

I have repaired lots of lifted lacquer chips this way and when it works, it can make for an almost invisible repair. Make sure your CA is fresh and is the thin kind.


Top
 Profile  
 
 Post subject:
PostPosted: Tue Oct 02, 2007 1:20 am 
Offline
Brazilian Rosewood
Brazilian Rosewood
User avatar

Joined: Mon Dec 27, 2004 3:50 pm
Posts: 4662
Location: Napa, CA
I've seen this happen after wet sanding pre-drilled tuner holes...water gets under the surface and lifts up the finish. Looks like it might be the same thing happening here.

In the case of my experience with tuner holes, the bushings covered it up. I've never had it happen at the neck location you show here.

Barry's super glue trick sounds reasonable.

_________________
JJ
Napa, CA
http://www.DonohueGuitars.com


Top
 Profile  
 
 Post subject:
PostPosted: Tue Oct 02, 2007 4:07 am 
Offline
Cocobolo
Cocobolo

Joined: Tue Sep 12, 2006 12:43 pm
Posts: 147
Location: United States
Todd, I used Mcfaddens vyn. sealer.


Top
 Profile  
 
 Post subject:
PostPosted: Tue Oct 02, 2007 4:08 am 
Offline
Koa
Koa

Joined: Wed Sep 28, 2005 2:58 am
Posts: 552
Location: Canada
I have had the same thing happen to me... Fresh, thin super glue did the trick, but there is a danger that the glue will seal the void before it creeps all the way to the bottom. On my neck, there was one spot that didn't get the glue & I had to pick off the loose flake of lacquer & drop fill the blemish.
If you work carefully from one end, perhaps holding the lacquer away from the heel with a thin Xacto blade (or even better, a fine scalpel) You can probably pull off an invisible repair.
These days, I chisel off that little ridge of lacquer before bolting on the neck.
If you slip & put a tiny nick in the lacquer at the edge of the heel, it will show... But, one or two drops of Tru-Oil trickled down the heel to side joint will disappear tiny imperfections.


Top
 Profile  
 
 Post subject:
PostPosted: Tue Oct 02, 2007 5:06 am 
Offline
Brazilian Rosewood
Brazilian Rosewood
User avatar

Joined: Tue Jan 25, 2005 6:16 am
Posts: 2692
What Barry said. Before you try superglue, you might see if you can wick in lacquer thinner from the end of a fine brush--also right on the corner, where it can wick under the lifted lacquer.

This may indicate that you are lacquering too thick, or using an inflexible lacquer that is not formulated for guitars. And do sand that leading edge so that the lacquer is flush to the surface before bolting. I actually find that no matter how well I fet the enck to the sides before lacquering, I need to do a little refitting afterwards, so that edge will be sanded as part of the final neck fitting process.

_________________
Howard Klepper
http://www.klepperguitars.com

When all else fails, clean the shop.


Top
 Profile  
 
 Post subject:
PostPosted: Tue Oct 02, 2007 5:51 am 
Offline
Koa
Koa
User avatar

Joined: Sat Jan 08, 2005 4:19 am
Posts: 1534
Location: United States
First name: Nelson
Last Name: Palen
In addition to what others have said about butyl cellosolve, lacquer thinner or acetone be sure to let the lacquer cure for a couple weeks before resanding and buffing. Otherwise it will shrink back over time and reveal the repair.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 15 posts ] 

All times are UTC - 5 hours


Who is online

Users browsing this forum: No registered users and 31 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to:  
Powered by phpBB® Forum Software © phpBB Group
phpBB customization services by 2by2host.com