I use sew n wash. Generally one layer works great, but sometimes I will double it, just to be on the safe side. When I am done, I lay my FSL out in a cookie sheet, then cover them with warm water, letting them set in it about 3-4 minutes. Then I remove them, blot them with a paper towel, then let them dry flat. Works great for me. If I want them stiffer, I don't let them sit in the water very long, or if I want them softer, I let them sit in it longer......