We are experimenting with Dupont's PYRALIN 2721 thick photosensitive spin-on polyimide film and are having problems getting good results. We do not have a spin development system, and most of the technical info is for spin development. Does anyone have experience with this product using immersion development techniques? Thanks, Kevin -- Dr. Kevin M. Walsh Electrical Engineering Department, Speed Scientific School University of Louisville, Louisville, KY 40292 (502) 852-0826 Internet address: kmwals01@starbase.spd.louisville.edu