I have had this same proplem before. I looked real good when I had first pulled it out, but than about a day or so later I saw these real fine cracks or spyder webing as you reffer to it. I just put it into the oven and cured it a little longer. Apperantly it wasn't completely cured, even though I had followed the time period for the curing.
Here is a quote from Non-stick "ALL thermoset plastics (what you guys use at the moment) has a 100% overbake resistance built into the powder. This helps you in two ways. 1) if you are forgetful like me and let it set into the oven for 40 minutes at 330F, no need to worry. Just take it out like you normally would and nothing bad happened. Or 2) If there is a cold spot in the oven or something just hasn't flowed out enough, leave it in for longer. The parts that have melted and flowed already will not be harmed during the cure cycle on bit."
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