I just did mine with Behr brand dual bonding primer and two coats of their "slate grey" one part epoxy coating. I used Sakrete brand caulk to fill any gaps between the wall and the slab. The Behr epoxy covers well and seems to be pretty tough. Haven't really put it to the test yet though.
Oh by the way...I got it at the Home Depot which I wouldn't normally recommend, but they do carry this product and it seems to work well for the $. Hope this helps.