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Most types of waterproof wax come in a plastic container or tin. Dip a clean rag into the waterproof wax and massage the wax into all of the exterior leather surfaces of the boot. Work the rag in a circular motion, and fully rub the wax into one section of the leather before moving on to the next. Apply waterproof wax to the boots once a year. Waterproof wax will seal the boot leather for many months. Waterproof spray comes in an aerosol can and can be sprayed directly onto the boot leather. It can be applied more quickly than wax, so opt for a spray if you don’t have much time to spend waterproofing your boots. Waterproof sprays may not need to be rubbed into the leather at all. Consult the directions on the packaging. The disadvantage of waterproof sprays is that they do not soak into the leather as well as a wax. Consequently, a spray will need to be applied several times during the course of a single winter. Whether you apply a waterproofing wax or a spray, you’ll need to give the leather time to absorb the chemicals and dry before wearing the boots. Air dry the boots until all of the wax has been absorbed and the leather is completely dry to the touch.  Place the boots in the path of a fan to speed up the drying process. The tongue should be propped open, and the fan should blow room temperature air on the boots. Never use a blow-dryer to dry the boots. The sudden application of heat can crack the leather.

Summary:
Apply a waterproof wax to the boot leather. Consider a waterproof spray instead if you’re in a hurry. Let the boots dry before wearing them.