Be aware that various trade names complicate and obscure what should be a simple issue. For example "Gorilla Glue" was once a name for a brown polyurethane glue (that you would be unlikely to use for micromounting). Now "Gorilla Glue" is a company that sells a variety of products with different characteristics, including a Cyanoacrylate "super glue". The same is true for Elmers, Loctite, Weldbond, and other products -- so pay attention.
I particularly like "Aleene's original Tacky Glue". This comes in a gold colored bottle and is sold in craft stores. It is thicker than regular white glue, which makes it very easy to work with. It can be removed by soaking in water,
I also use "Weldbond", which is another more runny white glue. I like this when I am joining two flat surfaces that mate nicely. Recent information indicates that this is not water soluble. I intend to make tests and perhaps abandon it if this is so.
One person I know got a gallon of the original Elmers, along with some lamp black and had it mixed at a paint store so he now has black glue, which is not a bad idea.
This is perhaps the best way to attach a cork or wood pedestal to a polystyrene micro box. The glue partly dissolves the plastic making an extremely strong bond. Unless you use an absurd amount of glue, this would never be noticed though.
I am now using "Loctite Super Glue professional liquid" that I get in a 20 gram bottle at my local hardware store.
Another fellow I know recommends "Rhino Glue", which is only avaialable online (either from Amazon or Rhino).
Not many people use this, and it is all but impossible to remove once it cures. You could of course view this as a virtue, but most people don't.
The clear Gorilla glue variant does not expand, but also is said to not work as well with the water soluble minerals.
Tom's Mineralogy Info / email@example.com