I'm trying to spin coat films of a diluted siloxane based polymer on glass. The polymer is diluted in toluene, and filtered very well prior to coating. It looks great before spinning, but it seems that the spin coating process is generating tiny (<10 micron or so) bubbles in the films, causing many defects. Has anyone else run into a problem like this? ******************************************** Carl Arft Dept. of Electrical and Computer Engineering University of California, Davis Email: cmarft@ece.ucdavis.edu ********************************************