If this is what you REALLY want to do, here is some help for you.
If you powder coat a M90 the snout will have to be gutted, not bearings or the seal should be in it when its done. Prime example of one that was not gutted when it was sandblasted, and then powder coated:
ClubGP Message Forum troubleshooting
The rotor assembly...not a good idea to send that through an oven, unless you fully disassemble it to remove the seals behind the rotor gears. You can do it...but you will regret it later down the road. Again...trust me on this.
The case, you will want to fully gut it as much as you can. The BBV butterfly flapper, there are two screws that hold the butter fly to the shaft, take the screws out, and then the flapper will pull out, and then the shaft slides out. You will want to take special care to seal off the exposed needle bearings that ride on the shaft, you do not want sand or powder getting in or on them. These are not fun to replace.
As for the needle bearings, they are the same as whats used on a genIII M90. problem being is a GenV does not give you "ports" to tap, and insert your threaded grease pressure remover tool to pop them out.
This is what the tool looks like:
Flip over a GenV there will be no holes in the case. I have designed a tool that will remove the case needle bearings from a GenV. It will pull them out instead of push them out. I just need to make it.
For the mean time, if they are not bad, seal them off good using high quality tape that will tolerate the heat from the oven. The special tape I use on my parts before they are powder coated will withstand temperatures up to 500*F.
I have never had to send in a complete M90 to be powder coated. I have done many snouts, and then I have also removed powder coating from blowers to polish them, and then a whole bunch of painted ones too for those who have changed their minds later down the road.
~F~