There are many types of glue and many recipes and methods of making them. This waterproof glue is one of the easiest to make, even easier than white glue.
The main ingredient in waterproof glue is gelatin. Although this recipe calls for unflavored gelatin, don't let that stop you from making raspberry glue if you want to! Gelatin of any kind will work, even kosher gelatin, some of which is vegan, according to PETA.
Gelatin, unless otherwise noted, is made from the hooves, skin and bones of animals - the cast off pieces. If you've ever boiled a piece of beef or chicken and cooled it to find that what was liquid becomes a jelly like mass, you've made gelatin. What you buy as a powder form is processed from that base.
So, to make waterproof glue, you'll need a half ounce package of gelatin of some sort and you'll need white vinegar from the grocery store. You'll also need glycerine which should be available at any drugstore. That's it, besides a little water.
The method is simple, too.
Bring three tablespoons of water to a boil and remove from heat, then stir in the gelatin until it's dissolved. So far it sounds like we're making that famous dessert, doesn't it? There's not much difference up to this point.
After the gelatin is dissolved in hot water, add a tablespoon of the white vinegar and a teaspoon of glycerine and mix well. Yes, that's all there is to it. You can store the glue in a jar with a tight lid, but if you need to use it right away, go ahead. It works best when it's slightly warm, so don't cool it first. If you want ot use it later, warm it by putting the jar in hot water.
It truly is waterproof, too. You can use it on leather, paper, cardboard and so on.
If you want a waterproof glue that's suitable for glass, use this variation:
Put a package of gelatin (cherry this time?) in a bowl and add a tablespoon of cold water. Stir until the gelatin is dissolved, then add one and a half tablespoons of boiling milk to it and stir well. If you want to keep this glue, add a drop or two of oil of cloves to preserve it because otherwise, the milk will make it go bad.
Store and treat this glass glue the same way as the original waterproof glue, above.