Full Chisel Blog

August 31, 2009

Fish Glue

Filed under: Hide Glue,Historical Material,Nautical,Of Interest,Techniques,Uncategorized — Stephen Shepherd @ 7:46 am

Fish Glue is a form of Hide Glue in that it is made out of the hide (or skin) of non-oily fish.  Details of this glue is discussed in Hide Glue – Historical & Practical Applications.  Fish glue has a couple of unique characteristics, one being it is more flexible and the other is it has an aggressive tack.  In other words it is real sticky.

There may be more suppliers but one good one, the one I use is Lee Valley that stocks Fish Glue in sizes up to 34 fluid ounces (1 liter) and has a good shelf life of two years.  Of course you can extend this by keeping the glue in a cool, dark place.  The glue is a bit more runny that liquid hide glue like Franklin/Titebond Liquid Hide Glue (you have to scroll around on their site) or Patrick Edwards Old Brown Glue, which is an excellent liquid hide glue.

Many people don’t like liquid hide glue and prefer to use it hot.  I like hot hide glue it works great in the summer time when the shop temperatures are high and the open time is extended.  Liquid glues, have chemicals added to them to allow them to be liquid at room temperature.  Liquid glues are very handy as there is no mixing and heating and can be used in a cooler shop with a good open time.  The long open time is also another benefit of animal glues.

Because of the high tack of fish glue it can be used in conjunction with slower setting liquid or hot hide glue called glue stacking.  This is where the high tack glue is used to secure an object in place while the slower setting glues take their grip.  This is good for vertical applications where hide glue may not become tacky enough initially to hold a piece in place where gravity is a concern.  But then gravity is always a concern.

First thing I did with the new bottle of glue was repair the sole on my reproduction Jefferson Booties.  I have repaired another pair with liquid hide glue, glycerin and alum.  The glycerin keeps the glue flexible and the alum makes it waterproof.  I have also repaired shoes with just hide glue and glycerin and when it was dry I treated the exposed edge with alum and water.  This in effect tans the glue making it waterproof.  I tried this one sole with just fish glue, nothing added, as a test.  If I have a problem I will add some glycerin for flexibility.

I have gone through three (17 ounce) bottles over the course of the last ten years and been very happy with the results.  I use it for repairing antique furniture as well as new construction.  I now have a big bottle (34 fl. oz.), which should do for a couple of years.  I go through about a gallon of liquid hide glue and a couple of pounds of ground hide glue for the glue pot and hot applications, per year.

And of course this stuff is superior to modern white and yellow glues in every way.

Stephen

8 Comments »

  1. Talas in NY City (conservation supplies) has small quantities of fish glue – excellent.

    Comment by rfrancis — August 31, 2009 @ 10:10 am

  2. Hi!
    Do you think fish glue is strong enough for common joinery (M+T, dovetails, half-laps etx) in furniture projects?
    I just ordered a 500ml bottle from LV, because I want to switch to repairable glues when it comes to my furniture projects (obviously I’m an amateur, not a professional) and wondered what strength to expect.

    thanks for the great blog!
    -toscano

    Comment by toscano — December 23, 2009 @ 11:05 am

  3. Toscano,

    It is not as strong as liquid hide glue or hot hide glue but it is still sufficiently strong to hold furniture together. Now that I have a big bottle, I am using it almost all the time. It is great stuff and a good introduction to ‘repairable’ glues. It does benefit from warming in a hot water bath, and have your wooden parts warm as well.

    Good Luck, let me know what you think.

    Stephen

    Comment by Stephen Shepherd — December 23, 2009 @ 3:16 pm

  4. Stephen,

    Thanks very much for your (very quick!) answer. I’ll probably try a couple of simple joint strength tests when it arrives so I can try to get a feel for it. Unfortunately it won’t be here for another 2-3 months as it’s being shipped with some Tried-n-True oil and varnish so it had to go via ground. Still, a delayed Christmas present 🙂

    thanks again for the info and the blog.

    best,
    Toscano

    Comment by toscano — December 23, 2009 @ 4:10 pm

  5. Hi. What’s your experience with using the glue for shoe repair? How much alum and glycerine do you add? what gram strength of hide glue did you use? What kind of glycerine did you use? THe kind in solution from the drug store? i’m about to experiment gluing soles back on an old pair of leather shoes…

    Comment by Meagan — February 28, 2010 @ 12:13 pm

  6. Meagan,

    As it were I use fish glue and glycerin to repair my traditional leather shoes. I am about to repair a couple of others I have that are in need. The hot glue I use is 192 Grams Bloom and most liquid hide glue is also made from that strength. I use glycerin I can buy at the pharmacy and add about 5% to the liquid hide glue to keep it flexible. I also will add less than 2% alum to make it waterproof. This can be tricky as too much will cause the glue to turn to leather, so I now just make up a wash of water and alum [the same stuff they use to make dill pickles] and wash clean up the excess glue that squeezes out, this does the same thing. Hope this helps.

    Stephen

    Comment by Stephen Shepherd — March 1, 2010 @ 9:00 am

  7. Thanks for the great article. There is simply a wonderful amount of glues out there. I was wondering if, and how much, fish glue can be added to hide glue to extent the set time.

    Strivin on,
    Paul Weaver
    lamareguitars.com

    Comment by Paul Weaver — June 20, 2011 @ 8:10 pm

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