Greetings all! I just got my first melting furnace and I’m excited to start this cool new hobby. The furnace I got is from a place called simond store. I mixed up the refractory coating according to the directions but it seemed like it lacked thickness. I applied it anyway yesterday. The insulation in the furnace is crispy but still kind of soft and have plenty of give to it. How solid is the insulation supposed to be after applying the coating?