I read in a previous post to apply skim coat to the surface with a roller. Good idea, but can someone expand on the whole skim coat application process a bit. I replaced the lower 5 feet of my bathroom wall with cement board (in the wet areas) and drywall around the rest. I want it to look like plaster so it matches the above section and everyone hassuggested skim coat. Thr problem is that the surface is vertical and skim coat is NOT easy to work with in my opinion. Any suggestions are greatly appreciated. Thanks.