Awesome instructional. I am sad that I have so abused my self by handling rock wool, and even asbestos wool, without adequate PPE. I learned a lot about the various materials and how to use them from this video that I wish I had known when I was younger and working with such materials What I enjoyed most was learning about casting metals with a microwave, because it is so much faster, easier, and takes less space and equipment than making a traditional furnace.

Thanks!