We had this old two piece foam art work that I did two years ago to put in our shower sky light to keep the heat and the sun out.
Recently we replaced the mattress in the RV, so I cut up the old one, we will eventually make some dog beds out of the rest of it, but I cut a piece up for the sky light. I traced the old piece that I made as a template.
Then I had some of the rolled up insulation stuff (I have that in alll my windows in the back half of the RV. So I put it on the top of the foam.
Now it fits nicely into the shower. Blocks more light and will help keep the RV cooler in the summer heat. I may eventually have a friend make some material to go around it for a nicer look, but for now, it works.
mac 'no more shower tans' gyvr