Tacky glue comes in a few different brands, but is essentially Elmer’s school glue that hasn’t been watered down as much.  If you have school glue, you can also leave it out in a puddle for a little while and it will get close to working as tacky glue does.

This glue does not work as quickly as glue gun glue does, but it is more permanent once it has set.  It also looks cleaner and more professional in most applications.  When dry, thin layers can flex on a surface a bit without cracking.  If your model has moving parts that somehow need glue involved, this is a glue to consider.  

 It bonds well to porous surfaces, but not so well to plastic or metal.  It dries clear or cloudy clear depending on how it is used, and mixes with latex and water based paints well.  I have used this property once when I wanted a cloudy tinted glaze over a picture that was in my model.  It can be used for mild texture, but once dry paint doesn't like to stick to it very much, especially if the paint is watered down at all.  If I'm using a wash effect on a piece of scenery held together with tacky glue, I try to paint the piece before assembling.

When using this glue with lots of tiny things, I like to make a little puddle and dip in it, instead of trying to squeeze glue accurately on a tiny surface.

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