Transmission Blasting, Aluminium Oxide 100 grit OK Options

[rstover]

I recently had the fan housing cerakoted and now I want to do the transmission. On the fan housing I removed all the grease and oil and the shop that applied the cerakote blasted it withe 200 grit aluminium oxide in a cabinet and it came out great.

I will get all the grease and oil off the transmission, but the blasting will be done with 100 grit aluminum oxide outside of a cabinet. I believe I have protected everything but was a little concerned about 100 grit being to course.

[toolguy]

I wouldn't use sand. . I doubt that any tape or sealing will keep all
of the abrasive out. . I'd go with plastic beads if you can't do the soda or dry ice, which
would be my first choice for an assembled tranny. .
However, all of this is a substitute for doing it right. . pull the trans apart, blast it, then put in in a vibrator ceramic tumbler, and you'd have a perfect original finish . . .

This is bare Mag, no paint. . it was then coated with an Aerosapce metal protectant from Boeing called Boshield,T-9. It is similar to WD40, but dries to a waxy protectant finish that penetrates the pores of the mag. . I did mine 8 years ago and it looks the same today.