Partial painting : seat tube
I am going to replace my front derailleur, and I would like to take this occasion to touch up scratches on the seat tube made by old clamp.
The seat tube in area of the clamp is scrattched pretty bad.
Can just I use auto paint spray?
How I need to prepare a surface for painting?
Do I need to spray some kind of protective coat as well?
Can i prevent scratches ?
I understand that I need to isolate painting area and cover the bike all over, but what else I should do to make it a neat job?