Hm, very interesting discussion. I have used tons of Heat n' Bond. Never once did I have an issue- until now. I am working on a quilt for someone who does not prewash her fabric. I always prewash, nothing goes into the studio until it's been washed and machined dried. Yes, you don't get that initial crisp, fresh look but nor do I have to worry about bleeding of colors.
Not only is the fabric not prewashed, it's batik. Yikes!!! Now I'm running scared. I have over 70 hours in this project and I haven't even started sewing down any of the applique yet. I sure hope there is no staining. I haven't noticed any. Now I'm afraid to go look.
best,
d