Well, By nature, we all know that PFX is a post-process.
By that, I mean that the Maya sw renderer renders the strokes AFTER everything else, AND over-top the image.

AND THAT SUCKS! ...on so many levels! hehe...

I remember a compositing tutorial on the Alias site that dealt with this, but due to thier redesign, it is not back up yet.

If you have Maya 5, you can convert your PaintFX to polys, and it should work just fine.

If not, then compositing using a z depth pass is required to pull this off.

Anyone else have any other tips?