Repairing hairline crack

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.

Repairing hairline crack

Postby Enrico Schiaffella » Mon Nov 26, 2018 12:46 pm

I just repaired a hairline crack on a soundboard. It came out ok. You can just feel a tiny protuberance corresponding with the crack. This is due to the finish. Should I keep on doing it until it’s all gone or I can call my job done? What would you expect from this kind of repair?
Thanks Enrico
Enrico Schiaffella
Posts: 12
Joined: Tue Aug 28, 2012 9:46 am

Re: Repairing hairline crack

Postby Clay Schaeffer » Sat Dec 08, 2018 11:47 pm

I would hope to not feel the crack when I ran my fingers over it with my eyes closed. If I could feel it I would try to add finish over it and sand smooth and buff until I couldn't feel the crack.
Clay Schaeffer
Posts: 1299
Joined: Fri Jan 06, 2012 12:04 pm

Re: Repairing hairline crack

Postby craig cowing » Tue Jan 15, 2019 10:19 pm

For bowed instruments in the violin family a cleat is the normal repair. It's basically a patch of maple or spruce that is feathered to the edge and it straddles the crack on the inside. You may want more than one.
craig cowing
Posts: 7
Joined: Fri Oct 26, 2018 4:55 pm

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