I don't know about anyone else, but I can't see anything in the second photo. Can you photograph outside without a flash, a little further away?
If you want to do it properly, this is what you do:
- Protect everything which you don't want to paint, using newspaper and masking tape. EVERYTHING which the paint can possibly reach!
- If the rust is surface only, use a medium grit disk mounted on a drill to grind down to the bare metal, ensuring that no corrosion remains.
- If the rust looks like it is through the metal, you can use a rust converting paint, but you may just be deferring and making worse the inevitable major rust cut-out and metal weld.
- Fill the entire area with a good quality body filler, so it looks just like the matching panel on the other side, or if you aren't skilled in its use, make it higher than it should be and sand it back (see next step).
- Allow the body filler to dry completely, then carefully sand the area with sandpaper which has been wrapped around a block of wood. When sanding, begin with a 36-grit sandpaper and work up to a 120-grit sandpaper.
- Use a spray primer to prime the area, being sure to use a primer specially designed for automotive use. Six coats of primer should be used, allowing each coat of primer to dry completely before applying the next coat.
- HINT: Every time you use a spray primer or paint, shake it for a minute, even if you used it two minutes before. Every time you finish spraying, turn the can upside down and spray until the nozzle clears, even if you plan to spray again in under a minute.
- Sand the primer using a 600-grit wet and dry sandpaper (wet of course). This will help to remove any scratches.
- The area should then be touched up with a matching automotive paint. Use at least three coats of light spray to start (Use 15 coats to start if you you are doing this on a Rolls Royce rather than a Honda). Use wet and dry sandpaper (wet) between coats.
- If the paint is not smooth, resand and repaint the area until you have a smooth surface. Don't get frustrated and don't spray heavily. You will get to a point where you will KNOW that the paint is right.
Regards
Warren