Ken and I were talking today about another probable solution. It draws me back to the frame I initially had planned for the back of the window with a recess to fill with Dow 795. That would forego a liner of any kind. It surely would validate my faith in Permadri products. We'll see how this free liner pans out. I do have some concerns about vinyl since historically it isn't fish friendly and doesn't handle a bio load very well. Clear plastic products yellow very easily under the same conditions as well. I'm willing to give it a shot though.
