When I made mine, I used liquid laundry starch and used a paint brush to apply it on both inside and out. Then I put toilet paper rolls where I turned the edges up and pinned the turned up parts so they would stay till dry. After is was dry I glued maraboo and trim to the edge and I was done. Very simple and looks good too. And it has kept its shape for over a year. Of course it has never gotten wet but, I think if it did all I would have to do is pin it up again till it was dry.