VEVOR Propane Forge Portable, Double Burner Tool and Knife Making, Large Capacity Blacksmith Farrier Forges, Mini Furnace Blacksmithing, Gas Forging Tools and Equipment, Complete Kit

Whether to use refractory cement does not affect the normal use of the stove, but the high-temperature cotton will be more durable after being coated with refractory cement. If you need it, purchase refractory cement that can withstand temperatures greater than 2700 degrees Fahrenheit. Our high-temperature cotton does not contain carcinogens. If you are really worried, we recommend using refractory cement.

The new batch of products does not come with refractory cement.

Yes, it does.

I just hammered on some 1" x 1/2" solid bar, it heated that up to forge welding temperature just fine so it should be fine for knives, maybe not swords.

If located at high altitude, the stove can work. However, at high altitudes, the oxygen content is low and the temperature may be affected, and customers may need to provide additional oxygen conditions.