Based on that, and another interview I found over on MTV I'm not sure she knows what she's talking about. Sure, the Raimi webs were trimmed by hand, but they were molded in CNC molds, and the whole things was designed in a computer at Sony Imageworks before that.
We might have to wait for the DVD special features to know for sure.
If you want to play around with silk screening webs though, you'll likely want to use high density plastisols with a stretch additive. But that wouldn't give you the clean, rounded look of the movie webs. On top of that, a puff additive would give the webs even less clean roundedness.
The he only thing I can think of is that they MIGHT have been able to use multiple screens with a decreasing width for the webs on each one so that each layer as it was put on top of the last was slightly narrower...but I wouldn't bank on that looks smooth and rounded. The webs look extruded not screened to my eye and until I see otherwise. That's what I'm going to claim.
As as I've learned, the costume designers and assistants don't always know exactly how things are made, just how they're supposed to look. You on,y have to go back and listen to all the people behind the scenes of SM2 claiming the suits were silk screened when we know now that they we're dye subbed.
Best of luck if you choose to experiment. You'll likely get decent results, but again, I, and friends I have who silk screen for a living, don't know of the technology that would great webs like TASM2's suit. My guess is she was actually referencing the brick pattern in that interview...just very confusingly.
-Nick
