Pine glue is not really pine glue. It’s conifer glue and can also come from spruces or firs. I doubt you’d get much from a juniper, and I haven’t tried a monkey puzzle or umbrella pine, but most of the conifer trees in the arboreal forests are valid. What you are looking for is the sticky, sappy ambery stuff that leaks out of injuries to the bark or wood – this is what is called pitch. It should be relatively golden, rather than white or black, for maximum glueiness.
As a pure substance it is too brittle to be useful as a glue, so you need to gently melt it before adding equal parts vegetable fibre and ground charcoal. That will give you pine pitch glue. Warm it up and experiment with it. I’m no expert on the range of recipes and their uses, but faffing about is always going to be the best way to learn. The sap of arboreal conifers is immensely useful anyway – it’s great for starting fires; drinking in a tea to soothe the stomach and the throat; healing small wounds (and stopping the bleeding); and treating fungal irritations.
If you are making this stuff primatively, it’s a lot easier than birch tar, because the initial extraction step is not necessary. You can heat up the sap by cooking it on a rock, mix it up with materials that are all around you, and be good to go.
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