Kimmeroo, I usuall heat the wax to 155 but I have heated it up to 170 before. I have poured at 110, 115, 120, & 125 to see if it made any difference and the only luck I have had was on the last one I tested when I used the LX-26 wick and the crack was still there but filled itself in very quickly and never showed again. All the other cracks don't even fill in when test burning. The only thing I haven't tried that I know of is heating the container.