I've just finished making a small pot of liquid hide glue. I'm using Don Williams' method of two parts hide glue pearls to three parts of water with one part of salt. Cook for two hours then refrigerate over night. After the over night in the refrigerator cook two more hours to finish. One of the advantages of his method is using table salt instead of urea. With salt there is no shelf life limit, we will see if that is true. I've a test piece glued and in the clamps, report on the joint tomorrow.
ken