- Leave a small air space in the warmer when pouring in the liquid. Be careful not to completely block the hole with the funnel, as this could cause the liquid to overflow and burn :(
- Between each warmers, stir the pan to mix the liquid and prevent the surface from solidifying.
- The liquid solidifies at around 58°C, so pour it in before it reaches this temperature, otherwise the funnel will be blocked. However, don't pour too quickly or you could get burnt. If the substance starts to cool too much, simply add a little water and repeat step 4.
- If the funnel is completely blocked, you can pour in some hot water and the solid will quickly become liquid and flow!
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