Hi, Norman…
The Veltex product is, essentially, Velcro, and made by them, I think? Because of the rough, soft texture, it absorbs light instead of reflecting it, thus less spill and great color saturation.
I haven’t used the white Veltex (only green), but I imagine it is just fine. However, color saturation is not a huge issue with white, and perhaps the little bit of spill would merely act as fill vs. softening the edges too much?
It’s the only way I would go for a traditional green screen, though.
🙂