Waterproof shoes and boots
If it’s wet outside, coat the tops and sides of your shoes or boots with WD-40 before going outside. The WD-40 acts as a barrier so moisture can’t seep into your shoes and wet your socks.

Repairing Squeaky Hinges
Nothing can be more irritating than a squeaky door hinge. Apply some WD-40, swing it back and forth, and the squeak should disappear.