Capt'n Bob said it well in his post above.
Although I use the two parts (in bottles like he shows) from another source, these epoxies are mostly the same.
I also simply squeeze a few drops of the resin and the same amount of hardener right next to it onto a piece of scrap plywood. Then, with a round toothpick I mix the two quickly and use the same or a new toothpick to apply it to the surfaces to be bonded.
The big advantage of epoxy is that it is 'gap filling', so the two surfaces don't have to be in exact contact, which is something that is very important with CA glues. With epoxy there is a 'cure time'. This is not to be confused with 'pot life'. The 'five minutes' on the label refers to the time you have before the resin kicks over and the end of the pot life. A full cure can take a few hours or a day.
I also have another epoxy that mixes in a ratio of 5 to 1 (resin to hardener). It's pot life is 30 minutes or more which makes it great for large parts that require careful alignment and clamping. The cure time, however, is a day or more.
One place where I insist on using epoxy is installing eye bolts. I have tried CA but you need the gap filling feature to really get a strong bond and not have the bolt pull out. There are lots more examples.
Edited by Modeler12, 07 August 2016 - 07:12 PM.