I have used it very often, since I teach trapunto. Is a very expensive thread. I always use it in the bobbin but not on the top. The reason for that is that when the piece is wet, the bobbin thread disapear and all you have to do to the top thread is to grab it, and since nothing is holding it from the bottom it will com off easily. If you use it on the top and use regular thread on the bobbin, you will have a thread trapped between your layers that could show. When I do Trapunto I mainly use solids and if the fabric is light you can see threads trapped in the batting.