Sounds like a stupid question, but how should we do it so it looks nice?

Just got a parking lot ding from a shopping cart. Took off some paint. IMO, from experience, sometimes when one use touch up paint, it looks worst. No more than 2-3mm wide.

Are there any advice, tips or tricks?

 

like my instructor say TOUCH UP PAINT dont work... lol

 

touch up paint depends on how big the scratch is....i am going to school for auto body so i know what im talking about....it you mix the right paint and use a small paint brush with a steady hand you can paint over the scratch without it looking bad. itll be a little more dull but you wont be able to notice it at all

 

i think.. get the same paint as your car. use a paint brush and paint it over that area... wait till it dry.. wet sand (repeat until it lvl with ur paint) sand n buff??

 

yea ^^ thats correct...make sure to wetsand it and id use a 2000 grit then buff it out with a wool pad.