https://www.frets.com/pages/0dgd5eve/Hide-Glue-in-Your-Kitchen.php

Good to read this too:  https://www.frets.com/pages/zlquzems/Ill-stick-with-hide-glue.php

I've used the grocery store gelatin for small jobs where strength and working time are not important, such as gluing a nut, or a shim on the heel of a neck.   Those actually building instruments such as gluing guitar tops, bracing, etc., may have a more refined method for assessing the strength of the glue and the gluing process.

you have to have your ducks in a row, your clamps and so forth “right there”, you don’t have much time. Nowadays they have all kinds of cheaper double boiler things with temp control you can set and if it gets too hot, it shuts off, and turns back on to maintain your selected temp. You want slower cure rate, add small amount of urine. It’s very very runny. I have not made my own with gelatin or anything else but I understand rawhide dog treats, old skin heads can be used also.

I know I have some around here somewhere, but I can never find it.

Ignore this! I don't know why the photo showed up and I can't find a way to delete it! 

'W-a-y off onto a tangent, but I recall as a kid, my Dad mixing his own casein glue to laminate arch-ribs for a machine shed.  https://agrocomplex.com.pl/blog/casein-glue/

Owen - I think that’s very useful

Sunburst-that is the correct way to pick
A moderator can delete, but might tell you to repost
Super glue - impossible to remove once it’s in place deadening signal

So……. Hide glue is detachable, cleanable and sustainable, but animal product. The best is horse hooves, I suppose one could use their own nails.
;( yuk.
Which urea is best?

Find gelatin at your market……. Better.

Dye your own tuner keys with fabric dye!
French polish is musical and repairable
I appreciate the opportunity

Shop-bought gelatin works but is hard to use - it gels in seconds, and once it has gelled it's no longer glue! So you can only use it on small parts, and only if you heat the wood to be glued (heat keeps the glue liquid).

Hide glue for woodworking gives you a bit more working time, though you still have to be quick.

It's particularly good for joints which might creep under stress (like guitar bridges), and is easy to clean up. It's also great for repairability, because new hot hide glue reactivates the old.

It's also cheap if that's relevant. I've built around 50 guitars and ukuleles and done quite a lot of repairs and I can't have spent more than $30 equivalent on hide glue. More important, it lasts for years in granule form so you've always got glue available, unlike say Titebond whose reliable shelf life is maybe a year.

The problem with gelatin is that there is no specific restrictions making the formula use the best parts of the animal.. The strong "glue" comes from the hide, but gelatin probably has bones and hooves etc in it. Basically diluting the glue.. different brands and/or countries may have different results.