How can wax seal not be poisoned?

Wax-sealed combustion gas is harmful, so it won't be poisoned if you avoid inhalation. Wax is usually in the form of wax sticks, some of which have cores and wax particles. When necessary, cut the wax stick into small pieces and put it in a small spoon. After heating and melting, pour it into the required envelope mouth and seal it. It is best to seal with wax, otherwise the head will be oxidized, blackened and rusted. Try not to press the seal by hand, just rely on your own weight. Wait until the wax is completely cooled and dried, otherwise the wax will easily stick to the seal, so you have to heat it a little and pick it off with a toothpick or needle.