I bought my car with this rear door edge paint chip. As you guys can see someone clearly kept hitting something and one of the times took off a pretty big piece of paint. I had touched it up when I bought the car but feared it will begin to rust overtime and it has.

Any suggestions on how to fill in the paint and prevent the rust from spreading?

 

Personally, I would have it professionally addressed. Any cleaning up and touching up you do will be a band aid with lots of room for it to come back. I would get a quote from a reputable body shop.

 

Nah you don't need a pro to "fix" that.

You just scratch out the rust thoroughly, and go slightly past to be thorough using a paint pen with a scratching tip. Then paint over several thick coats and use the built in clear.

Use this and you'll be golden. Go around the entire car.

https://amzn.to/2MOFXmn

You really only should go "pro" if it's a large area of rust. But on something like a chip, that's baby cakes handled in 5 minutes.

 

to piggy back off of this suggestion.
get yourself a glass fiber pen to help "sand" down a circle.
once its past the rust you can just apply the paint pen.

 

Sounds like a good idea. I wonder if that's the same as on the paint pen i linked? It's also white in color and very very abrasive. i've sanded down some rock chips that had rust under and used it on a friends car that had rust spots due to rock chips. Made quick work of the rust. really scratchy.

 

Thanks! Will give this pen a try and hopefully can get a thick coats on it to help make it less noticeable.

 

Yeah just rub it in a circular motion until all traces of rust are gone. then wipe with rubbing alcohol after and let evaporate (happens in a second) before applying paint.