I sprayed my fenders a few months ago & now see some small flaws. I think they will sand out and am wondering how to spray back over the small flaws after I'm done ? Should I spray the whole fender again or just a small area around the flaw ? I put three coats on originally, should I again spray three coats on the repaired area again ? Thanx guys for the help !!

Always best to paint "edge to edge". If you do a blend and don't paint the entire panel, you will probably have a "blend line" come back later.

It's a good idea to put the required coats suggested by the paint mfr. to provide enough UV protection so the paint doesn't break down later.

Hope that helps.