I have no experience with Armorpoxy, or (recent) experience with any epoxy coatings, for that matter. The epoxy coatings I had DOT experience with in the late 1980s, used as "attempted" bridge deck overlays, performed miserably. Several manufacturers' products loosened and came up in large sheets within a few weeks of having been applied, and both applications were done with factory technical reps on hand "to make sure everything was done right."
I suspect a lot of progress has been made in the epoxy surface coating industry in the last 30 year, so you might get lucky. Just make sure your surface prep is up to snuff, getting all loose and potentially loose (delaminated) material removed before you start the application.