I have a neo-angle shower with a coated masonite shower panel that got scratched a few years ago. While I was cleaning the shower, the panel fell apart. Apparently moisture got in through the crack and turned the masonite to mush. I am now preparing to replace the panels with solid plastic panels. What is the best adhesive to use for this? Also, I was wondering how I can put pressure against the whole panel while the adhesive dries. When I installed the original panels there were a few places where the panel did not stick very well. I would like to avoid my past mistakes.