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A light skim coat of metal glaze provides a better surface than heavyweight filler, goes on evenly, is easier to sand, and leaves virtually zero pinholes. It's more like a topcoat for regular filler that you can sand and prime. We used metal spreader to pull the glaze across the middle of the old filler. If you are working with an edge, start at the body line and work away from it to help keep it intact.