Official Luthiers Forum!

It was probably a combination of the two. The first time I sealed a top with shellac, I only did one side and it potato chipped on me. I sealed the other side and a few days later it flattened itself out.

Shellac is one of the best film moisture barriers we have out there. If you seal only one side, the rate of absorption is way different from the other side. I now seal both sides when I do seal. My finished instruments have sealed insides too. Not a lot of people do that but hey, to each his or her own.

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Hi Todd,

I've been threatening to try this....do you have a problem with CA sticking, or is the rubber immune?

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If using CA I'll just push the problem area into place and tack it with a little CA and while holding it in place touch some accelerator to it from a swab or the end of the pump hose. Obviously, don't hold it in place with bare fingures. Little pieces of UHMW cut from scrap with notches cut into them or formed to your liking works pretty good as a placement/ holding tool/caul.
As for fitting the binding to the channel, John Hall's tip about knocking off/ beveling the inside corner of the binding so that the binding will seat well into a rounded channel corner is a great tip that's simple and easy enough to do with great results.

Hello since the subject is mentioned ..ive been wondering this for ages

Has anyone ever tried/made a flexible caul for the task ?
the shape of angle iron with notches in it...
but made from a material like those flexible school rulers that you can roll
just a thought
tomas