Drip drip drip pool rust.....
screwed a thin aluminum strip onto the rear drip rail raising rail's height 5/15th's ". Used #6 SS screws in Loctite. capped with silicone.
No drip in, water runs off to sides.
Was using a jamb to jamb plastic sheet under the doors. The height addition generally solves the run in problem.
2008 E250