Shoe Goo. I have used this for many years in custom aspects of car audio and fabrication and it is a great bond once it dries but if you need to remove it someday you can without damaging the paint. They make an "automotive" version, both available at walmart but it is really the same thing. just be careful using it in the heat as it gets runny if it is really hot out so use as little as you can get away with. It will adhere to both the rubber and the door if cleaned with alcohol really well.