I drove through a total torrential down pour in my 97 +4 that had a folding screen on the way back to Bucks up the A303 after joining Frank 4X4 for part of his coastal drive for Help for Heros.
The screen was not the issue & perfectly water tight unlike the sides of the doors etc.
My 94 4x4 also had a folding screen and again no issues in the rain.
