I, too, am a Crayola Washable Marker gal but I bought an aerosol spray at JoAnns' from June Tailor marked "Quilter's Stencil Marking Spray" in a blue can, but haven't used it yet. It is WHITE for marking on dark fabrics and I thought it might stay better than pounced chalk. I think my LA used it but cautioned to spray lightly. It supposedly comes out in the wash. I would try it first on a sample.