I have a walk in with concrete floor.
I have painted on UGL's DRILOK paint and had limited longterm results,by this I mean,it still turns mildewy,has deposits that won't clean off,and is altogether a hassle(no window to ventilate the room either)
I have had to use muratic acid to etch it twice in 5 years,Its due for another one now(Thanks for reminding me

)
Hope someone has a good idea for you too,I'll be watching for other posts.
Ken