Originally posted by HOTRODPAINT

Beginners tend to "oversand" filler, to make the edges pretty. When they finally paint, they discover that they can see a slightly depressed shape called a "repair ring". At this point, you have created the need to spot repair the paint, and that never is quite as good as the original finish.
Theres no need to "Feather" the edges out of primer, when I did my '51 chevy bodywork and filler work, I featherd the edges out but, I hand sanded it back and forth, going well past the filler and then back, well past the filler until it was smooth and feathered out. what am I suppose to do when sanding filler?