I use Wonder Under fusible by the bolt on my huge appliques and satin stich each piece down with a very stiff stabilizer behind the piece which is removed after the stitching is done. Every quilt I make then goes through the washer and dryer. Works well for what I do. If it is something that needs handquilting, I use Misty Fuse which is soft and pliable.
Each piece is satin stitched. The fusible keeps the edges flat and from fraying before being stitched down.
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