Hide glue the oldest of all the glues commonly used in woodworking. With any glue there are pros and cons. The cons are the glue must be hot, some form of a double boiler must be used, it can spoil, open time can be a concern, and cheap glue smells badly. The pros are reversibility, easy to repair, easy of sanding, perfect for hammer veneering, non-toxic, no creep, will stick to old hide glue, and best of all the glue is transparent to most finishes.
Hide glue is the ideal traditional protein glue for veneering, and with a bit of practice you can successfully veneer without a pile of clamps or the need of a vacuum press. It's the perfect glue for the occasional user. You can do many joints just by rubbing the wood together until they get tacky and stick - no need for clamps.
Commonly hide glue is sold in many different "gram strengths." The higher the gram strength of glue the tackier and stronger the glue. The stronger the glue is often the less "open time" you have. For this simple reason I only stock 192-gram strength hide glue. The hide glue I stock is made by the last supplier of hide glue in the states and it's the highest refined hide glue available with the least amount of odor.
Use equal parts of water and glue. Once the glue is in liquid form the rule for adding water is hot glue means hot water/cold glue means cold water must be used. Ideal temperature is 120-150 degrees. Anything higher and the glue will start to cook and weaken. If any mold is formed the glue shouldn’t be used. If the use the glue isn’t regular than it can be placed in the refrigerator for safekeeping.
In granule form the glue will be good standing for 100 plus years.
If interested in purchasing some glue please visit my etsy store found here: https://www.etsy.com/listing/489778424/hide-glue-192-gram-strength?ref=shop_home_active_1