I have used the premixed liquid hide glue for about a year now with no complaints and no problems. It can be reversed and the piece can be reglued successfully (I make enough mistakes that I can attest to that).
I have used hot hide glue but I found it "bothersome" to me to add urea to the melted glue depending on the termperature of the shop and the wood. When hot melt glue starts to gel you better have everything in place, because the "open time" is over. If the shop and wood is cool enough it can gel immediately if there's no urea in the mix.
With the premix liquid hide glue I've had no issues with that at all and the glue joints turn out stronger than the wood around them, which is all I'm after. I haven't even turned my hot melt glue pot on for months now.
I agree that urea is a pain. You may be using too high a gram weight hide glue for the work you are trying to do. Matching the gram weight of the glue to the job is important. Of course, keeping the parts warm here in Texas is not that tough!
DP
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