Same Color, Different Layer = White Hairline. Any Fix?

OK, I know you've all encountered this before...

You're drawing a character. You put the, say, his body on one layer, and his arm on an upper layer. Even though the arm and the body are the exact same color, where they meet there is a tiny, annoying hairline that annoyingly announces they're on separate layers (for an example, check out timberwolf.com. I notice this on all of that cartoon's characters).

The worse thing is, it's not universal. If you scale the character, increase or decrease the zoom, or even watch the cartoon on another resolution the line may become more noticeable, less noticeable, or disappear entirely. So it's not that Flash can't handle the same color meeting on separate layers without producing a "seam," it's just some kind of bug that comes and goes depending on what size the character happens to be.

So kids, two questions:

A) I haven't take the plunge into Flash MX yet. Is that damn line still popping up?

B) Anyone discovered any fixes for this annoying problem?

Thanks guys,

make the paint go over the area where the line is.

Hmm, that works pretty well, but I can still see a seam where the underlying layer ends, even after I stretch the upper layer's paint over the bottom. Oh well, I guess this is probably as close as I'm going to get to a fix...

A workable comprimise may be to go the path of least resistance. That is, work WITH the difference instead of AGAINST it. Make the two objects a different shade on purpose and shape the object accordingly for the best visual effect.

A two-tone segmented arm or leg could give your character an added bit of dimension. Supplement this color arrangement by adding two-toned shading to other areas of the object, even when those areas are not meant to be on separate layers or move independently.

Visualize the difference between a cube defined by black exterior lines and colored within those lines; and a cube with no exterior lines, whose side are defined by differences in colors or tints and tones.