Changing the colour's suit (damned lines always visible)

[synthsin75]

I see what you mean, Mike, about it being no kind of 'workaround' if you're just starting over. I guess I'd call it initial guidelines then.

But for a workaround, I guess you can always just create an outline shape on top of the offending edge, and instead if hiding the edge, give that bit of outline the same color as the fill. You may have to increase the line width until it covers those below it, but it should be easier than redoing the whole shape.