The S2 in Bobs pic looks something like mine but has diff windows.
Mine simply has a normal opening port where that one has the third
window. There is an 8.5M S2 2 slips down that looks to be a year newer
than mine and it has the three windows in the pic AND an opening port
in the middle of the forward one.
My boat is 24 yrs old and the windows have never leaked. My theory
about this is that water gets behind the lexan and when it freezes it
pushes the lexan out since it is not held in by anything but adhesive.
This only happens to boats up north and not here.
Mildew does not seem to be a problem either and I think it is due to
the two dorade vents. I am sure there must be some mildew but it isnt
evident. Since I seem to be immune to any mold or pollen, if any is
there, it doesnt bother me at all.