after installing a bathroom tub,in a corner of the room it been desided to put a wall murrial on the wall. the worse part is also adding a shower head comming down from the cealing right in the center. I need to find a product or covering ( of the wall paper ) that will seal it from the shower. Someone said to use Varathane several coats or a sheet of thin plastic what would you use ? is their another way ? or product ?