A few months ago the mirror accidentally hit a post in underground car park, so it caused very minor scratch to the frame.

We bought the Scratch Fix All-in-1
https://www.duplicolor.com/product/s...ouch-up-paint/

and attempted to fix based on the video
https://www.youtube.com/watch?v=MB_v8nAXhlE

but after painting by the brush, it looks a bit rough (not applied coat yet), please see the image.
Capture (1).JPG

Can you please advise what will be the next step to fix it properly? We wish it could restore to the original state.

Should I sand the rough painted surface firstly then apply coat? (I bought 1200 grit sandpaper)

Or start coat on top of this surface and then sand?

Many thanks!