Is Epoxy Adhesive Glue (specifically Araldite) a good insulator
Yes, epoxy is generally a good insulator.

There are some types that are formulated to either conduct or at least bleed off static charge.  That has to be done deliberately with certain additives.  If so, this will be prominently featured on the label.

For example, I vaguely remember that 3M makes a "conductive" epoxy that has a lot of carbon in it, which also makes it look black.