pretty much any interfacing is flamable...no different using dryer sheets or pellon interfacing. it is all the same 'stuff' only difference is the (softener/chemicals)added to the dryer sheets and if you have used them that is probably gone. they do not dissolve. and as long as they are stitched in place there is no migrating. they work just like any interfacing are light weight, you can draw on them. i have a quilt my grandmother made in the early 80's has dryer sheets used behind appliques just like discribed. this quilt has been through 3 kids now adults, 3 kids still kids and it has been washed LOTS! there has been no noticable problem with the choice of interfacing.