When we replaced the window panes on our 77
Scamp 13 it turns out that I bought the wrong thickness of plexiglass and it leaked - I should have noticed that the gasket was a bit loose but did not. But I was able to make it work by taking out the panes and padding around the edges of the window pane with Gorilla tape! I had to experiment to get the right number of layers, but was able to get it tight enough that it does not leak. That is, except for the one I missed that I am going to redo this week!!
So maybe that is what happened at a window pane change by a previous owner - the replacement was too thin and it leaked. Gorilla tape was easier than trying to find and buy the correct thickness of plexiglass since Randy had already cut the
windows to size!
Janet