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PostPosted: Sun Dec 30, 2018 2:44 pm 
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Joined: Sun Jun 25, 2017 3:58 pm
Posts: 275
Location: St. Louis area
I'm wet sanding, and it appears that the back joint, near the tail end, is opening up. I can feel the seam with my fingernail. Have no idea what to do about it. Advise? It's nitrocellulose lacquer finish, 12 coats.


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Last edited by Kbore on Mon Dec 31, 2018 8:38 am, edited 1 time in total.

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PostPosted: Sun Dec 30, 2018 4:16 pm 
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Joined: Fri Mar 03, 2006 7:09 pm
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Location: Hegins, Pa
is it open or glue shrink?

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PostPosted: Sun Dec 30, 2018 7:26 pm 
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Location: St. Louis area
tippie53 wrote:
is it open or glue shrink?

Looks and feels open. I can feel it with my fingernail, and it has liqueur slurry in it. The back was glued at least a year and a half ago. How would I tell if glue shrink?

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PostPosted: Sun Dec 30, 2018 9:12 pm 
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Joined: Fri Mar 03, 2006 7:09 pm
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Location: Hegins, Pa
if it is cracked you can press your thumb on one side and feel it move
I think you have glue sink . Did you use a filler?

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John Hall
Blues Creek Guitars Inc
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Board of Directors of Association of Stringed Instrument Artisans
http://www.bluescreekguitars.com


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PostPosted: Sun Dec 30, 2018 9:15 pm 
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Joined: Sun Jun 25, 2017 3:58 pm
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Location: St. Louis area
tippie53 wrote:
if it is cracked you can press your thumb on one side and feel it move
I think you have glue sink . Did you use a filler?

I did use use filler, Aqua Coat over Behlen vinyl sealer. Aqua Coat about 5 filling sessions.

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PostPosted: Sun Dec 30, 2018 10:04 pm 
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Joined: Fri Mar 03, 2006 7:09 pm
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Location: Hegins, Pa
good
check that it is an open crack use naphtha and see if it wicks into the wood that you can see it from inside.

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John Hall
Blues Creek Guitars Inc
Authorized CF Martin Repair Center
Board of Directors of Association of Stringed Instrument Artisans
http://www.bluescreekguitars.com


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