I used scratch and dent counter tops from menards. 16' in length was like 40$ and makes for very easy cleanup.
Now In my shop I just have 2x6x18' long work surface but in front of the lift i am going to buy a metal tool box top for my bench for 180$.. then I can spray brake clean on parts and weld right on the table.
As for garage flood paint, if you prep it really well the epoxy floor is pretty good but it will eventually look like crap. Chips, wear, etc.