Had my car parked on my drive which is on a slight incline, opened the door and forgot to hold it at the same time so gravity took hold and it hit my wall!

Luckily/unluckily the plastic trim on the side of the door seems to have took the brunt of it, but some paint on the door edge has come away and exposed bare metal.

I've bought touch up paint to cover it up, but just need some advice.

I'm not looking for a perfect finish as it's not really in a noticeable place and I'm not that good when it comes to painting anyway.

My main concern is just to protect it from rust.

Where the door hit the wall, the paint/metal has 'peeled' back leaving metal curled up slightly so I would need to slightly sand this back to make it an even surface.

What grit sandpaper should I use for this etc?

Thanks,

Very light wet and dry paper will flat it back.. Meguires Unigrit 2500 grade will be fine.. Or any light cut paper would do just go carefully... Once touched in with the right colour (Go to the dealers armed with the VIN number for the best possible match) and touched over with lacquer it wont rust... You will hardly notice a repair on that part of the door...