thanks alot to brian and cffisher. i think because i`m useing a small sanding block its killing me. and i did sand away the transition between bondo and metal.all i have left is where the repaired part is. i shaved the door handle, welded in the metal plates. that part looks good it is blened nice with the edge of the door. it`s the other side, their was a dent that i couldent knock out so i filled it and i kept sanding off the traces of bondo. which i would have needed to blend into the metal.
also some one told me that i should use tiger hair after i weld any panel. they said said it would prevent the bondo from flexing. how true is this.