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Last week I applied two coats of body filler to the front apron, sanding in-between. After the last coat the surface was rough, so I did a little sanding to straighten it out. I applied some black guidecoat and sanded again to reveal the high and low spots. And I also used the guidecoat on the top surface of the apron. So I continued sanding to bring down the high areas to the level of the lows, creating a uniform surface.