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Thread: Hide glue?

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    Hide glue?

    I have a bottle of "Old Brown Glue" whose "Best before" date is March 2017. I think that it's still good to use within a reasonable time frame after that date but I've never used hide glue.

    The label says that the glue viscosity is best between 100-140 fahrenheit but my stuff is a bit less viscous than honey, flows freely, and sure doesn't need heating to work with it.

    Thoughts and suggestions please.

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    Re: Hide glue?

    Try it on some scrap, see what happens. Won't hurt nothing. I have used hide glue. The real stuff that takes heating in a double boiler (I use a hot plate, metal teapot, and a tin can.) Never tried your stuff. Just give it a go.
    Berta

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    Re: Hide glue?

    Depending on how you have stored it it would still be good.
    Nothing beats a try but a failure, failure is an opportunity to learn.
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    Re: Hide glue?

    Quote Originally Posted by Berta View Post
    Try it on some scrap, see what happens. Won't hurt nothing. I have used hide glue. The real stuff that takes heating in a double boiler (I use a hot plate, metal teapot, and a tin can.) Never tried your stuff. Just give it a go.
    +1. Seems like I read a blurb from a chemist at Franklin who said their liquid hide glue will keep a whole lot longer than the date on the bottle. Seems like he/she said to pour out a glob on a board overnight and see if it's hard the next day. If so you're good to go....

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    Re: Hide glue?

    OBG flows nicely anywhere north of 75, so its consistency wouldn't necessarily be an indicator of a problem. I like to use it around 80-90F... I find the recommended temp to be too runny.

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    Re: Hide glue?

    The Old Brown Glue web site has more information. It will last longest if stored in the refrigerator. Patrick says that the smell will be a good indicator if it's too old. This is animal protein so you should know if it smells bad.

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    Re: Hide glue?

    Jeff, What are you using this glue for? I would mock up a similar joint and see what it does for you after it cures for adequate time.

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    Re: Hide glue?

    Thanks to all for your replies and advice. My old bottle of "Old Brown Glue" (best by date, March, 2017) has very little odor and it's not a bad odor at all. The OBG website says their warranty ends on the best by date but some batches have remained good for up to 2 years so it's use at your own risk.

    I'll eventually use the glue on this shop stool but I've gotta fit the stretchers first.



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    Re: Hide glue?

    I don't want to "hack" Jeff's thread, but I have a related question.

    As Jim Wallace mentioned, I stored mine in the refrigerator.
    I thought I had ruined it as it was nearly solid for hours!
    I waited until the next day to use it, and it seemed fine, but I wanted to know if anyone knows if this is a "normal" thing and how quickly you should expect to be able to use the glue after taking it out of the refrigerator.

    Also, I am concerned if the "thermal cycling" of the glue will damage it?!
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    Re: Hide glue?

    I take it out of the fridge and put it in a pan into which I run hot tap water. Note - I do not heat the water to boiling on the stove. The website says that you can do this as many times as you like without damaging the glue. Hank is right; if you just take it out and let it sit in the shop it takes a long time to get thin enough to use. In the warm water it's just 15 or 20 minutes.

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    Re: Hide glue?

    Heating and then refrigerating or freezing of traditional hide glue (HHG) can reduce its strength slightly each time you repeat this cycle according to what I've researched but overheating above 160f it can kill it fast. I keep small squeeze bottles (~2 tablespoons/30ml) full of hydrated HHG in the freezer and only take out what I think I'll need for that session and float them in a baby bottle warmer with water adjusted to 145-150f. If any is leftover it goes in the fridge or freezer and I try to use it first next session so it doesn't get re-used again. Since Old Brown Glue and Titebond's Liquid Hide Glue have anti-gelling additives, they don't need to have the high heat (~145-150f) of HHG to liquify and delay gelling.

    The only other issue related to reusing and storing any protein glue is bacterial and fungal contamination which can happen if you use a dirty brush/container or you keep it uncovered and drifting sawdust carries the critters into it. I clean my glue brush and bottles well with antibacterial soap between sessions as those critters love protein. The old European guys used to use a stick of Linden (softwood related to Basswood) with the end frayed as a brush. I've read it has antimicrobial properties. I like using the nozzle on the small squeeze bottles because it's fast and accurate and don't need to use a brush except on wide joints.

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    Re: Hide glue?

    Thanks, Jim that is helpful!
    “Think about it: Everything with a power cord eventually winds up in the trash.” John Sarge, timber framer and blacksmith instructor

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    Re: Hide glue?

    According the the FAQ on their website, heat it to 140-160.

    Storing in refrig extends shelf life.

    It is not the same as hide glue in that you cannot hammer veneer nor do rub joints with it.

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    Re: Hide glue?

    It is not the same as hide glue in that you cannot hammer veneer nor do rub joints with it.
    Curious! What's the basis for this claim? Less initial tack than hHg? The urea additive (about 10%) makes the hide glue a liquid hide glue in the bottle but reduces the tack and increases the working time.

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    Re: Hide glue?

    Someone I know who is an expert at marquetry told me + OBG says it in the FAQS on their website.

    You have to clamp it or use a vacuum press.

    Now I use it for regular gluing not veneer. For veneer I use either genuine hide glue made from crystals or lately I really like the PVA/hot iron technique.

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