Not exactly, using layers of tape, something that pulls off easily like blue tape, build up a few layers over the existing area, say 10 inches round or there about. Then when you carefully peel it off, it will retain the original shape. Might not be necessary, but if the rust goes beyond a simple 1 dir curve, then it will help duplicate the oroiginal shape of the metal the patch needs to look like. When the tape is peeled of, you can stop the sticky side from stikcing to itself by hitting it with talc, or dust. Same result.