White ink cracking is a sign that it is under-cured. Depending on the ink it will have to reach a temperature of between 300 and 320 all the way thru the ink deposit. Curing with a heat press is a hit and miss ordeal at best and the temp gauges on most heat presses are not that accurate. You can also have hot and cold spots on a heat press that can vary 20 to 30 degrees one way or the other. You may want to try increasing the time in steps until you find the time and temp that will work. And remember when you put a shirt under a heat press you suck the heat right out of the element and it takes time to recover. On my conveyor dryer I have the shirts in the tunnel for around 120 seconds with a temp of 560 degrees in the tunnel.i have tried every setting 350f 200 seconds
light pressure and white ink is cracking
330f 180 seconds same resulte and even tried
please i need help any one with a solution
You may also what to look at which white ink you are using. There are some that are made as what is called "Fast Flash" and these will fully cure quicker at a lower temp than other whites.