Fred,
If you are willing to use a large amount of epoxy primer, you can paint both sides of the plate. On my 30 I filled the water jacket to almost full with primer, wrapped the jacket tightly with saran wrap, flipped the jacket around a few times, and then drained out the excess paint.
The difficulty is making sure you get the metal super clean and properly prepared.
This was probably not absolutely necessary, but it was a fun, very messy little project.
Excess paint draining can be seen here:
http://packardpaddock.com/page2/page35/files/IMG_1245.html Tom
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