I didn't put any thinner in the paint because this paint is advertised as not needing to be thinned. The following is what the company responded to me.
The cobwebbing is generally the result of spraying the paint too dry. So either your airbrush settings are not right, the temperature is high, or you've added a thinner. Our paints are already thinned, and ready to spray, so there's no need to add anything. Try turning your air pressure down and opening up the paint flow on your airbrush. Do your best to even out the coats in order to reduce the "dark" spots before applying your backer color.
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