I got this in an email from FWW today about the properties and use of hide glues. I found it quite interesting. Hide glue is actually stronger than most synthetic glues with the exception of epoxies. It is also possible to take things apart that were joined with hide glue which isn't easily possible with synthetics. If you notice, there are antiques that are hundreds of years old which are holding together just fine that were joined with hide glue but anything made since 1970 or maybe a bit earlier eventually fall apart. I often use fish glue which is similar to hide glue and there are a number of jobs it excels at.