Official Luthiers Forum!

Do you shellac the channels?

Any staining issues?

What to use for cleanup?

I say Duco but actually I am using the Stewmac Bind All which I was told is a similar replacement.

Regards.

For them who remember, Duco Cement was for years the go-to cement that held together balsa wood model airplanes. Simple nitrocellulose glue.

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Peter Havriluk

I would shellac the channels-can't hurt
the glue might melt it-don't use too much glue.
you could brush epoxy-let dry-it may change your channel width & depth.
Why are you using Duco?
Mike

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Mike Collins

It was recommended for the style-45 rosettes I am installing. There is a strip of poly that gets removed after it dries so that I can then inlay abalone. Apparently CA will glue the poly in but Duco won't.

I suppose I could do some experimentation.

If your "poly"is teflon you can use CA, at least the CA I've used. I've done ab purfling this way.

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Jim Watts
http://jameswattsguitars.com

I've done rosettes with Duco (which is acetone and dissolved cellulose nitrate for gap-filling and body) and with CA...

- CA does not really stick to virgin MDPE or HDPE strips, but because they change width and depth dimension less than the teflon strips when pulled for removal (AKA, <French name beginning with P> Ratio), they may be harder to extract.

- CA sticks to any possible combination of materials , while Duco has a hard time hanging onto vinyl and ABS/PVC alloys. Duco is less likely to stain spruce than CA, although CA will not discolor spruce with two light applications of shellac sealer

- As long as good quality CA is used, CA will double as filler and leveler over shell, so we routinely filled the channels with it once the shell got snapped in, and scraped level. Duco is a poor filler, as it shrinks too much to reamin level between shell segments and cannot be used as a leveler.

- Given everything can be taped or tacked into place on a complex rosette scheme without worrying about the short open time of Duco, we seldom found a need for Duco.

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A constellation only takes shape when one maps the whole.
- Beth Brower

I have used Duco for wood rosettes and herringbone edge purfling for many years, with no staining of the spruce. No shellac needed.
Duco cleans up with acetone.

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John

no need to use shellac duco is a perfect glue for rosettes and purfling. That is all I use. No staining cleans up well and is finish friendly

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John Hall
blues creek guitars
Authorized CF Martin Repair
Co President of ASIA
You Don't know what you don't know until you know it

Thanks y'all. I could not find for a fact that the Stew Mac Bind all stuff is the same as Duco. So I tested the strip and found CA doesn't stick to it so I used CA.

I've always used CA. Works great, I can pick viscosity. Super thin allows setting the piece and wicking. One less glue in the arsenal. Rocks it on 45 rosettes. As for the shellac, dewaxed for me. I always coat my tops with it during build (and edges) just for protection in the shop. Stupidest things happen in the shop and it's quick surface protection from any contaminants.



(ha I pulled the last photo out of my image gallery, not realizing it was one I had pulled down as a good 42/45 example - this one is mine done in CA)