I looked at all options for my garage 57 eyes, even the epoxy-coat. glad i didnt do that Jeep Junky, that *****.
after much research, i ended up using the Rock Solid kits. you can see pics in one of my last posts or pm me and ill send you them.
I read a lot about epoxies and their durability and really wanted something that would hold up and i would never have to do again. It was easy to install, took me and a buddy one day, and it looks great!
Really easy to clean, i have spilled gas . . . you name it on it, i actually filled one of my dirt bike tires with that slime stuff you get to patch holes, it leaked out onto the floor and i could not get it up, i called them and they told me to use acetone or MEK, came right up, looks like new, i have dropped a jack and a few other things and havent noticed any damage either.
i have seen the stains that you are talking about, didnt do much research on those because i really wanted something that i wouldn't have to apply again, or at least a very long time, but people use them outside all the time, i dont think they really protect anything, they typically spray on some kind of clear sealer on top of the stain after they apply it, i assume it is just cosmetic.