For mirrors, wipers, door handles etc I use my pun vise and drill a small hole in the item and the body where it locates and pin everything in with wire or a styrene dowel. I usually glue the dowel into the part. Leave it long then after the glue is dry I stick it to the body. Glue from inside and then trim the dowel off so it does not interfere with anything inside. Voila! No glue on outside paint