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Thread: Old reddish / pink glue? (NMC)

  1. #1
    Registered User Drew Streip's Avatar
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    Default Old reddish / pink glue? (NMC)

    My neighbor picked up an older Giannini Craviola steel string flattop for cheap and brought it to me to fix up and make playable. It appears to have suffered from some "hot car syndrome" -- the bridge is substantially lifting, the pickguard is lifting a bit, there's some belly, and the fretboard is heavily pitted. I'm a little worried about neck angle, but it'll be better with the bridge in the proper position.

    My REAL question is, the glue visible under both the bridge and pickguard seems to have a reddish/pink tint. Any ideas what this might be?

    At any rate, I plan to remove it all and use double-stick tape for the guard + hide glue for bridge. It's a nice bridge, and the back/sides are highly figured (laminate).

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    Default Re: Old reddish / pink glue? (NMC)

    Maybe resorcinol glue? Years ago, I glued together some exterior white oak benches with resorcinol glue. It's a two part glue that is reddish-brown. It is described as a precursor to epoxy glues. https://en.wikipedia.org/wiki/Resorcinol_glue

  3. #3

    Default Re: Old reddish / pink glue? (NMC)

    Drew, I know not that much about this instrument, but I do know the bridge is not supposed to be glued down at all on mandolins. I’m guessing that what you’re seeing at both places is the finish/stain getting soft and transferring. The color could be from that. I’m also guessing that if excessive heat was the problem, and the thing is old enough to have proper hide glue everywhere, that you should tap the top and back to see if there’s a loose seam, and check the neck joint for movement once you add some tension. Somebody with experience could also check the other important dimensional issues especially string height, neck warp and perhaps loose internal bits.

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    Registered User Drew Streip's Avatar
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    Default Re: Old reddish / pink glue? (NMC)

    Quote Originally Posted by Richard500 View Post
    Drew, I know not that much about this instrument, but I do know the bridge is not supposed to be glued down at all on mandolins. Iím guessing that what youíre seeing at both places is the finish/stain getting soft and transferring. The color could be from that. Iím also guessing that if excessive heat was the problem, and the thing is old enough to have proper hide glue everywhere, that you should tap the top and back to see if thereís a loose seam, and check the neck joint for movement once you add some tension. Somebody with experience could also check the other important dimensional issues especially string height, neck warp and perhaps loose internal bits.
    Richard, itís not a mandolin but a flattop steel string guitar.

  5. #5

    Default Re: Old reddish / pink glue? (NMC)

    Oops!

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    Registered User Timbofood's Avatar
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    Default Re: Old reddish / pink glue? (NMC)

    Richard, we all do that from time to time!
    Timothy F. Lewis
    "If brains was lard, that boy couldn't grease a very big skillet" J.D. Clampett

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    Registered User Timbofood's Avatar
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    Default Re: Old reddish / pink glue? (NMC)

    After thinking about the resorcinol glue thing and coloration or, discoloration. Way back when I was working at the music store (75-78) there seemed to be a batch of “seconds” floating around here from Gibson that clearly illustrated the bracing with “reddish/brownish”staining through the tops. A high school buddy had a “Dove” with the bracing pattern clearly visible.
    Don’t know if that helps the price of cocoa in Denver or anything else.
    Timothy F. Lewis
    "If brains was lard, that boy couldn't grease a very big skillet" J.D. Clampett

  8. #8
    I may be old but I'm ugly billhay4's Avatar
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    Default Re: Old reddish / pink glue? (NMC)

    The resorcinol I used back in the day to make canoe paddles was pretty much pure brown after it cured. No pink or reddish tint.
    Bill
    IM(NS)HO

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  10. #9
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    Default Re: Old reddish / pink glue? (NMC)

    It would be weirder than resorcinol, but polyester resin used for fiberglass work is pinkish.

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