Hot melt glue has a basic problem - it melts when it gets hot. It forever
limits where the stuff can go. They must be kept out of a hot car, and the
components cannot get hot.

I have used epoxy before and it works fine for all sorts of potting
projects. You can color it or get it clear. Rf properties are good.

Remember, however, that when you encapsulate something, you trap the heat
inside - so the temperature rise of the encapsulated components is greater
than free air.

Colin K7FM