Photoresist - that's basically photo emulsion. You're already there, though I guess the things you're currently coating with (and the very thin layers you're making) mean you're using much less viscous emulsions than the typical photo emulsion.

Why does the flow rate not increase proportional to the radius (alpha = radius * omega^2) ? I would have expected the resulting coating to come out with a 1/r thickness profile unless there are thin-film effects that cause flow to cease at a certain minimum thickness. Can't say I know nearly enough fluid dynamics actually...