I drove mine with the D shaped gasket in the rain many times over the seven years that it was a daily driver. Never had an issue with it. The side window gaskets did leak until I adjusted them to be sure that they had contact all the way around the perimeter. After that, no leaks. This is in Virginia Beach, VA. Not as much rain as Florida (I lived in Orlando for about a year), but we do get rain here. Since my side windows are removable, my biggest problem was anticipating the rain and getting the windows installed in time to keep the rain out.