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Pour the wax beans into a microwave-safe glass or bowl. Set your microwave power setting to 20 percent. Heat the wax for 10 seconds, then stir it. Repeat the process in 10-second increments until the wax is melted. Reheat the wax as needed when it starts to congeal.
A heat-resistant glass mixing bowl is probably your best option here. Make sure the bowl is large enough so that you don't have to fill it more than halfway with hard wax beans. Use your bean package for guidance on how much to use. You'll probably need around 24 oz (680 g) to wax one of your legs. At full power, the microwave will melt the wax unevenly, causing some spots to be dangerously hot while others aren't melted at all. Setting your microwave lower will help to heat the wax more slowly and evenly.  Superheated wax could spontaneously erupt when you go to stir it, which could cause serious burns. Heat wax in the microwave very slowly and very carefully. Check your user's manual for guidance on reducing the power level on your microwave. After only 10 seconds, the wax beans will look like they haven't melted at all. However, once you begin to stir them, you'll see that they're beginning to lose their shape. Stirring helps to ensure that the wax beans are heating and melting evenly, so don't skip this step!  Use an oven mitt or towel to grab the bowl—it may be very hot! Use a silicone spatula, wooden spoon, or wooden wax applicator stick to stir the wax. Pop the bowl back into the microwave for 10 more seconds, and make sure it's still set at 20% power. Stir the bowl again. Once the wax seems evenly melted after stirring, use a heat-resistant thermometer to check it—it should be between 125–160 °F (52–71 °C) for use on your body.  Do not use the wax if it is over 165 °F (74 °C), or you may burn your skin. Melting times vary based on your microwave and the amount of beans you're melting, but it probably won't take more than 6 rounds of 10-second heating increments. While a microwave is the quickest way to melt hard wax beans, it provides little residual heat to keep them at the ideal temperature. Within a few minutes, the wax will drop below 125 °F (52 °C) and start to get too clumpy to apply to your skin. When this happens, pop it back into the microwave for 10-second increments as before. Make sure the microwave is still set at 20% power.