Just put some seam sealer in it. Do NOT put Bondo in it... just a neet bead of seam sealer, smooth it out with your finger and paint it. Here's my drip rail with a fresh application of seam sealer just before primer. The picture is looking down on the driver side back corner. You don't have to remove it if it's in good shape and you don't want to fill it right up so it's full of sealer... just enough to seal the pinch weld.
