Based on the input from the GT-40 forum, I had the ZF media blasted at a local shop. After that, I masked and painted the two sidecovers, and the tail cone.
GT-40 Forum - Cleaning ZFs
I sealed all of the holes up with "Gorilla Tape". I made a big cardboard cover for the front and taped that all up as well.
Tranny was bead blasted with 80-120 grit, ~75 psi. Shop was instructed to not blast from the front.
One of the reasons to get into the case (above and beyond the safety wiring) was to ensure that none of the "beads" had gotten into the seals.
Rocky
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