I'm not familiar enough with the alumina oxide process to comment on your
questions, however, I do know an excellent general purpose resist.

Morton Electronic Materials (Dynachem) has an exceptional product, called
Laminar 5000.   Some of the features are:

Wide process window.
Acid/alkaline etch
Very good adhesion, even in gold plate applications
Good tenting properties
Excellent resolution

Laminar 5000 is available in 1.3, 1.5, and 2.0 mil thicknesses.  If you
require further information, please contact me, or your local Morton or
Insulectro sales representative.

Mark Dowding
Regional Technical Specialist
Insulectro
909-943-5758

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