I have extremely clean drains, and no water on the floor. Even so when it rained the interior became generally damp, so much so the seat belts would be damp. I noticed that the roof immediately absorbed water when it rained, so I sprayed it with a can and a half of silicone spray. Now the interior stays dry even after a Texas downpour. The silicone did run over the paint after the firs rain, but the car was waxed and it cleaned right up. Now the water beads up and rolls off the roof.
