This is my 2017 4Runner on the driver's door sill with a small rust bubble on the corner. I am looking for advice on how to prep, seal, and paint it so it doesn't cause any further issues. I just want it done properly being that the truck is only two years old and I live in a heavy salt state (NY). I am planning to remove that plastic trim this weekend to see what else is going on under there. Any advice is greatly appreciated...