Here's what works for me as well as the girls in our LQS - we use the Floriani water soluble - 2 layers - stitch out the design - when done soak in water for about 5 min - take out lay on towel and pat dry. Beautiful lace is what you'll get. Enjoy!
PS. I tried with some that had that plastic look to it and it didn't work it tore and I ended up with a huge knot. Hope this helps. :lol: