there're polymer-modified concretes that'll be suitable for your needs but you won't find 'em at the apron stores,,, seek a pro const supply house instead,,, then you can stain & seal suitably UNLESS you pick green or blue which're not recommended for exterior use,,, we never apply epoxies outside nor do we know of any which're suggested by any manufacturer.
self-leveling mtls're usually gypsum-based & do not accept stain w/acceptable results,,, neither do they have tension strength, only compressive,,, even pro's have trouble if they choose that method,,, there're admixtures you can select for cementitious products but its a reinvention of the wheel,,, pick the bagg'd stuff that's readi-made.
we've removed to much tile from ext conc to think its worth it - certainly not at my house,,, there's no 'paint' that'll adhere to conc for long,,, if you seed any coating w/reflective glass beads, visibility AND traction will be improved,,, you'll also have a glow-in-the-dark set of steps, tho !
saving $ by initially using incorrect mtls/methods costs MUCH more in the end,,, just my opinion based on 35yrs in the craft.
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