Hi,
I have a white Ford Fiesta Encore 1.3 1998. Some of the paint has come off both bumpers. I'm intending to get a can or two of Ford matching paint and primer from Halfords.

Can someone explain the steps I need to take to spray up the areas where the paint has come off? Spraying the primer on the area concerned, then the white top coat on that seems straightforward enough. I think.

I'm wondering though, about flatting down to provide a key? What grit, wet or dry? Don't the flatted sanded area and the sprayed primed area need to be exactly the same size and how do I do that? If I sand an area and then prime it, but say if there is a 1 inch over spray boarder around the flatted area, will the primer not adhere there, and the scratch marks will be visable?
I know what I mean but is a bit hard to explain.
Also same as painting a door where paint has flaked of, will be an uneven surface and the flaked areas will be clear even though has been painted.
Will I have same sort of problems with bumpers if so, how do I avoid.
Cheers.