Peckish

I wonder if they were actually using nylon and just believed it was poly. A lot of people confuse the two. And nylon will melt like crazy.

Yes, it's a Superior product. I have no idea if they've pretested it. I've been using it almost exclusively for piecing and applique for about the last 5 years.

Several years ago I made a blouse from a lovely rayon fabric that had beautiful drape. Washed and wore it once, the side seams frayed. Stitched it back up, wore it again, then a shoulder seam frayed. Showed it to a friend's mom who did tailoring, she advised me to sew French seams and then topstitch them. That did the trick, but I was rather flummoxed that the rayon would fray so easily. It was not loosely woven at all.