One (Coat-it) has kevlar in it, is less expensive and is black the other doesnt and isnt.
Both must be covered as they are an epoxy based product and not UV stable
No need to blow it all apart and have a topic for each facet of a project. Some find it helpful to have everything all in 1 topic, start to finish. For those helping, its often useful to see whats been done already and how you got to a particular place when you ask about how to proceed....