I used high gloss white so I could scrub down the walls easier. thinking about stealing a couple of the wife's cookie sheets to put on top of the poo board so they can be pulled out & hosed off easier. I'll let you know how that goes after her discovery and the whooping to follow
We use a galvanized auto drip pan under our roosts. It was an inexpensive Walmart find. It is light weight and rigid enough to not bend when loaded with chick poo. I just dump the load in the composter, hose off the pan, and put it back under the roosts after it dries. I do scatter some pine shavings and DE on top of the pan to help keep the poop from sticking and to help dry it out.
I don't have any poop catchers, I have a good 2"- 3" of shavings on the floor and I change it about every 2 weeks. I cut to fit and laid white wall board (the stuff that is used in bathrooms almost like paneling) down on the floor, it is smooth and easy to clean, it's not nailed or screwed down for easy removal. I plan on insulating the coop so I will probably use the white wall board to cover the walls after I put in the insulation, either that or I'll use luann and just paint it.
We picked up a good sized length of vinyl flooring at Home Depot for 5 bucks and laid that out with 3-4" of pine shavings on it. We shovel out under the roost every other week (goes to compost) and the whole coop every other month. So easy and stays real clean.
We used marine/industrial enamel. It's oil based and takes a full day to dry, but resembles plastic coating when it sets up. The floor of our coop is a few sheets of OSB and they painted up really nice with this stuff. Very scrubbable.