Repairing a crack with humidity issues?

If you have a string instrument of any kind that needs fixing, a mistake you made in building a new instrument that you need to "disappear," or a question about the ethics of altering an older instrument, ask here. Please note that it will be much easier for us to help you decide on the best repair method if you post some pictures of the problem.
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Posts: 1
Joined: Sat Feb 11, 2012 10:52 am

Repairing a crack with humidity issues?

Post by iamtherealmungo »

After completing the body of my new acoustic build I discoverd the back had shrunk considerably and was rather flat. I purchased a hard case immediately and began humidifying the body back to health.. it's going rather well and the back is returning to almost it's original state (lesson learned there!)

however, I have now discovered a small(ish) split/crack along the grain on the lower bout starting from one side of the bottom block and running about 30-40mm along.. my only guess is that this has been caused by the dry climate it was built in so I cannot be intirely sure when it happened exactly.

My question is. How would be best to go about this repair? Should I carry on humidifying the instrument fully before attempting to repair that crack or should I repair the crack now and continue re-humdifying it afterwards?

The crack is slightly open and under pressure does not FULLY close although it is less visible, what would be the best method of repair?

Any ideas people?


Clay Schaeffer
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Joined: Fri Jan 06, 2012 12:04 pm

Re: Repairing a crack with humidity issues?

Post by Clay Schaeffer »

Humidify it until it does fully close, then repair it with hot hide glue.

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Greg Robinson
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Location: Coburg North, Victoria, Australia

Re: Repairing a crack with humidity issues?

Post by Greg Robinson »

Hi iamtherealmungo,
Please note that we require the use of full names (first and last) as usernames on this forum, and aliases are not accepted.
Please let us know your name so we can update your registration. Thanks.
MIMForum staff member - Melbourne, Australia

Steve Senseney
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Joined: Fri Jan 06, 2012 2:45 pm

Re: Repairing a crack with humidity issues?

Post by Steve Senseney »

I agree with Clay. A picture would help.

Karl Hoyt
Posts: 36
Joined: Sun Jan 08, 2012 9:04 am
Location: Cape Cod

Re: Repairing a crack with humidity issues?

Post by Karl Hoyt »

definitely re-hydrate first. ONe cool trick we use in my guitar building class is to put the guitar in a big plastic bag (if you don't have a case) ... and blow it up like a balloon. there's just enough humidity in your breath to make a nice humid environment for the guitar to re-hydrate.

give it a couple days and that crack will close right up.. then I prefer yellow carpenters glue to HHG for sealing up a crack on the side (as well as a spruce patch)


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