We didn't run our vinyl up the walls. We built the floor, then added the vinyl, then built the walls. So, unless it gets a cut in it, it is sealed.
I clean my coop from poos almost everyday, so it doesn't get that dirty. I have pdz and pine shavings and use a kitty litter scooper. Plus, I only have 4 hens so it is probably not going to get super wet with the way I tend to things. We were using what was on hand and built my coop for next to nothing. When, I replied to this thread, I had a question about the black jack plus wanted to throw out another option for the OP. That's it - no other ulterior motives.