Bathroom Shower Panels

I am remodeling a bathroom and need to cut a window in the panel vinyl shower. What is the best way to caulk, borders, and install the window the way?

To cut the hole in the vinyl panel according to the thickness you can use a razor blade or well my favorite would be to use a spiral saw cut. Once the hole is cut, you want to run a bead of pure silicone in the same color as the panel around the inside edge of the panel stick to the wall and the waterproofing. I tape the edges of the panel to the window frame of 24 hours to ensure a close link with sufficient drying time. Trim any excess silicone with a cutter. Finally I would like to cut the edges with "VINYL CORNER MOLDING. Apply a bead of silicone inside the right corner molding in the center, it stand up, then use small finish nails completely secure. I leave this tape on the 24 hours also.