"Zip texturing". Yikes, that was like voodoo to me when I read about it 'back in the day'. Never did try it. Nothing wrong with using either WS or your own concoction. For a little layout like mine, I'll stick with the WS stuff. Bigger layouts may need a different solution simply based on cost. But like everything in the hobby, it's up to you. Some folks may love making their own ground foam while others may loathe it. No different than my complete hatred of anything involving wires and soldering. I'd rather spend the time building structures. There's so much to enjoy and sample in the hobby you need not get bogged down worrying about taking the easy way out with some things.