Barb, I have been stitching FSL for awhile now and once I know that the designer - I trust that their FSL is good - I have never had to use anything but WSS (water soluable stabilizer) I rinse them out under medium hot water (I don't like the stiffness - so I rinse all the stabilizer out for bookmarks) - then blot them dry between two towels or a terry cloth and place them flat on a surface and usually blow dry them - as I don't have patience to wait for them to dry on their own and it makes them not as stiff, too! I have used toulle only when I don't trust the the design is FSL - if it looks like it will not be true FSL - then I might use it - just in case. If you feel you need it - then use it - but I wouldn't think that you would need more than one layer of it. Good luck - can't wait to see all these new projects.
You can do fsl on a single layer of tulle but I recommend you still use WWS with your tulle fabric, or at least I read that sometime ago I believe it was on emblibrary.
I use a layer of WSS with the tuil. I've done this with non-FSL too.
I have doubled the toulle and it stitches out GREAT, and I don't have to soak them in Hot water, set out to dry and reshape. I trim around the edges with a sharp embroidery scisors at nite while watching TV.. I've gotten 25 done in 2 days. LOOK OUT I'M on a ROLL...:)
FSL does not need anything but water soluable doubled, but if you decided that you like it better on Toulle, I would definately double it because it does have a bit of stretch. I would turn one piece in North/South direction and one piece in East/West direction.;)
I seldom ever use anything but 2 layers of wss & everything turns our real well. If I'm doing a design with a lot of thread snips n byween I'll use netting along with the wss. *4U Welcome to the cute site bl. We r very glad to have u with us
FSL does not need a permanent layer of material. Therefore I do them on a single layer and use a layer of solvy on top. That gives a bit more volume while stitching.
It's a clear water soluble stabilizer. Solvy is just the name of the company that makes it.