Rethink the Rules of Liquid Hide Glue
I’ve just finished writing an article on liquid hide hide glue for Popular Woodworking Magazine that takes a critical look at the adhesive compared to yellow glues. My hope is that it’s a fairly dogma-free article.
While liquid hide glue will probably always be my favorite adhesive for interior work, there are some cases where another glue is a better choice.
During the research for the article, I talked to adhesive scientists, glue makers and even visited Franklin International’s factory during the summer with a long list of questions. After getting some surprising answers, I put their assertions to the test in my shop.
I’m going to share some of the surprises here. For the rest, you’ll have to buy the magazine (sorry, editors have to eat, too).
One of the alleged downsides to liquid hide glue is that it expires after about a year in the bottle (though it can last 18 months or longer depending on how you store it or who is giving you the information).
But then the scientists at Franklin showed me some dried glue samples they had recently made with 10-year-old hide glue. The dried glue film was as hard as glass – just like you would see with a fresh bottle.
What gives? As Dale Zimmerman at Franklin explained, it’s all in how you store the glue. Heat and water are the enemies of liquid hide glue. So if you leave a bottle of glue open in your shed during the entire muggy summer (or in a hot car), you could ruin the glue before the expiration date.
But if you store the glue sealed up and in a cool basement, the life of the glue is greatly extended, as the tests at Franklin showed (which I repeated in my shop).
You don’t have to freeze it. You don’t have to store it in the fridge. In fact, Zimmerman cautioned that by storing it in a cooler the glue could take on water from condensation when you warm it up. Zimmerman’s advice: Just keep it sealed up in a cool basement.
Now some woodworkers would argue that glue is the cheapest part of any project, so why take a chance with old glue? It’s a good point, but think of it this way: If you store your liquid hide glue properly you don’t have to stress about the expiration date.
How do you test hide glue to see if it’s still good? That will be the subject of my next entry on this topic.
— Christopher Schwarz