Should the fire insulation be sealed with refractory cement before use?
Other forges come with some of this cement but maybe they use a different type of insulation??
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Whether the stove is coated with refractory cement will not affect its use. Applying refractory cement will make it more durable. If you want to apply cement, you need to purchase refractory cement that can withstand temperatures greater than 2700℉.
Please refer to the figure below. The actual data may be slightly different from the measured data because the high temperature cotton is elastic. The link is valid for 3 days. https://we.tl/t-VtIRqaEpvW
