I have a 1999 Alero I have some rust on the drive side rear end that I'm trying to remove and paint over I have bought some paint had the paint made to match car anyway need as much help as possible trying to bend the paint into the rest of the car i have started with primer and ran into first problem ...over spray how do remove this ?

Just wet sand it off

ok thanks now what about trying to blend the paint into the rest of the car ?

try a compound