For this type of DIY upgrade, you can’t go wrong with a ball of natural beeswax. Beeswax can be found in most hardware stores, where it’s commonly sold as a lubricant. If you’re unable to get your hands on beeswax, a clear, odorless paraffin wax candle (such as a tea light) will also do the trick.  Whatever type of wax you go with, just make sure it’s not dyed, or you risk staining the shoe. If the shoes you’re trying to waterproof are expensive or irreplaceable, you might want to use one of these products just to be on the safe side. To ensure that the wax settles properly, you’ll want to start with a spotless surface. A quick wipedown will help remove dust and light debris. For older pairs that have seen a lot of action, it may be necessary to send them through the washer and dryer before you start waxing.  Waxing the shoes without cleaning them first will trap dirt happens to be clinging to them. And, since they’ll then be waterproof, cleaning them after the fact can be tricky. Make sure the shoes are completely dry before you proceed. If you’re anticipating bad weather, it may be a good idea to wash old shoes a few days before you plan on wearing them. Before you start rubbing away, make a small mark low down on the heel or sidewall of the shoe close to the outsole and see how it looks. That way, you can make sure it won’t stain. Keep in mind that much of the contrast will be eliminated after the wax melts.  A colorless or off-white type of wax will be the least conspicuous and blend smoothly with the materials and colors. If you're using a colored wax, make sure it matches the hue of the shoe as closely as possible. Rub the wax back and forth vigorously to form a thick layer over any part of the shoe you want to make off-limits to moisture. Really dig in. Imagine that you’re coloring with a crayon. Pay particular attention to the areas around the toe, heel, sidewalls, and laces where water has a tendency to seep in.  Double check that you’ve coated the whole shoe. Any spots you’ve missed will be...

TL;DR in Chinese:
准备一块蜂蜡或无色蜡烛。 用湿布把鞋子擦干净。 在鞋子上找一个不显眼的地方测试蜡。 在整个鞋子表面抹一层蜡。 将吹风机调到最大的热风。 晃动吹风机，慢慢地从鞋子前面吹向后面。 继续加热，直到蜡消失。 测试防水效果。