While in the dept. Spray enamel and sandpaper allow you to make mass-produced lures smoother and better. The measuring spoons will help you create AND duplicate good colors. With a little practice, you can create some very original color patterns. Diving lips are the business end of any crankbait.
Longer lips cause the lure to dive deep, and shorter lips run shallow.
Also, thinner lips dive deeper, due to less water resistance. A knife-blade edge on a diving lure, can increase diving depth. This works very well on metal-bladed crankbaits. This is still OK, as all depths are productive, at some time or place. All of these tips can help you catch more fish, of any species.