Homemade furnace refractories - backyard.
2019-11-23 · Let dry at room temp for several days. Then bake at low temp (225/275)for several hoursand no. smoke or steam coming out of it. Then let it cool down completely. and repeat at a little higher temp. each time till it's fully baked in. Method #2. 1.5 parts Portland cement (This is 'NOT' a ready. mix stuff.Get Price