With the help of ultra violet rays, the theory is the fish can see the bait better. I see no difference. Perhaps just another trick to get Buckeye dollars to the land up north. As to the finish I spray 3 0r 4 coats of clear varnish on all the new spoons before adding a split ring. I also add a reflective eye. It works for me. Jager Bomb, Flo Nascar, Sir Walleye, Mixed Veggies. In the western basin it's scorpion spoons: 2 1/4 inch. West of Green tomorrow.