What you're after is this
http://www.aircraftspruce.com/catalo...agtreatkit.php
The conversion coating will clean the mag up and prep it for paint.
The paint you are referring to is
zinc chromate.
http://www.aircraftspruce.com/catalog/cspages/zinc.php
The green is the color shown on the can in the picture. The yellow is about the color of avocado meat.
The warning about
zinc chromate and lung cancer is not kidding. Best to paint the tranny out of the car and outside.