Quote:
Originally Posted by EricSilver
....Should I be using a primer/filler on such a small area (a half-moon shape, approx the size of half a nickel)? .....
My second question is: Is blending simply a matter of painting-sanding-clearcoating-sanding and then clearcoatiing again? ... I assume there will be a perfect match after spraying, and certainly after blending.
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Whether you'll need filler or not depends on the penetration of the rust, under the paint/primer. If it has etched small pockmarks in the surface, which will be apparant after the rust has been removed, you might need a skim coat of filler. Often, a thick primer will do this for you. I avoid spray bombs of primer if that is the case (way too thin, which it has to be to go through the nozzle). I use a urethane primer-surfacer, mixed to manufacturers spec, and sometimes a wee less reducer to thicken it up.
As to the blending process, you need to think of the surface of the damaged area, after final sanding of your primer and/or filler, as being just below the surrounding area by the thickness of the finish paint coat(s). If you are using straight enamel (sprayed from a bomb or paint gun), just build the repair surface up to just above the surrounding paint, then sand it down until you are level (I use lots of 2000 grit wet). You'll see the blend when the edge of the area around the spot begins to get removed by the sanding.
If you are using base/clearcoat, color fill to just cover the primer with enough to blend with sanding, then clear and sand level like enamel.