Noah,
What brand BCB are you using and how old has it been sitting? Does it
flow very slowly when you are dispensing it? I was
having the same problem spinning on a silicon wafer sample and it turned
out to be that the BCB had been sitting on the dispense bottle for some
time. As soon as I got a new batch of BCB the problem was solved.
hope this helps,
Lester Lopez
University of South Florida