I recommend using a centrifugal mixer. We use the AR-100 Thinky Mixer. You may need to add some solvents to get the viscosity of each individual component close to improve mixing. Toluene should work since it's compatible with both materials. You may then spin the mixture to create a film. If your film needs to be very thin, you can spin on a layer of PVA first to allow the layer to release from your substrate if needed.

thanks  a lot Ron