Have any of you guys had experience with Turtle Wax's F21 car polish? It claims that it is made with urethane polymers that give "ultra shine" and "durability." It also claims that the formula also fills in light scratches and swirl marks pretty well. I must have bought it last season, as I stumbled upon it by my wash bucket today. After much searching, it doesn't seem anyone has used this and lived to tell the tale!