For potting and bonding, I use a few Loctite (Henkel) products sold under the Hysol brand.
Hysol formulas are available in a variety of viscosities, cure times and hardnesses.
How about this one [
LINK]
Loctite® E-60NC™ Hysol® Epoxy Adhesive is a general purpose, electrically non-corrosive potting compound and multi-surface structural adhesive with a 60-minute working life. Black, opaque, low viscosity.
The ad copy says "low viscosity" but it is about 8,000 cP ... probably about like pouring syrup.
Here is the whole catalog:
[LINK]