I think it's a strong effect. The method is really simple and it CAN be used on any can. The only reason I gave it four stars instead of five is because it only comes with printed instructions. If you are really a visual learner, think about your purchase. The instructions are pretty clear though. Also, hiding the gimmick can be tricky at points, but only a little practice can help!

**TIP** Use water with brown food coloring (mix the colors together) instead of using coke, I've heard things can get pretty sticky.