Shawn should be the official word here, but until he responds ... Starting with the necks of the MEII they use a marine epoxy to fill any large pores, then seal the necks, and then highly buff them out. This is what has made the current ME RW necks so smooth feeling. They are not finished with V12, nitro, etc ...
This may or may not be what they do with other models with the optional RW neck or any earlier models. My SCT IRW was unfinished and not as smooth as my Quatro.
In PS you get what you ask for ...
Since Experience is coming up ... This is one of many great reasons to take a slow tour of the factory and spend time with the people who build the guitars.