Is it safe to use a microwave for small aluminum melts?
What do I need to add so that I don't destroy the microwave?
"From a hardware store on Fourth Street, I bought a silicon carbide sharpening stone and 3 pounds of tin/silver plumber's solder; from Macy's, I purchased a microwave-safe casserole dish and a stainless-steel measuring cup; and at Williams-Sonoma, I found a cute cast-iron cornbread fish mold and a pair of long-cuff leather grilling gloves. " - PopSci's Theo Gray
A good source of silicon carbide? A better material? (I don't even understand its purpose here).