I would like to spin coat an epoxy material that was originally designed to be used by screen printing. For this, I've tried to dilute the epoxy with a solvent until it is thin enough but when spinning I could not get rid of the comets/flare defects. it seems that there are many micro bubblers inside the material which "pop" when wafer is spinned and they are the ones causing the comets. what is the best way to take out the bubbles out of the material? Pot life of the epoxy is 3 days. thanks