there was a real problem in my Casita
with the shower walls were not sealed well and it looked as if the walls were made on the outside of the floor or what is known as the
Base. I used Flex Tape where it was obvious that water coming down walls was just going down under shower stall Base.
I used White and if you take your time you can get this tape on so it will look good and it will flex with any movement of trailer and walls.