I use steam a seam 2 and I like it alot; it's light and easy to use but I sew over the applique. I'd be concerned with any stablizer that over time it would come lose or fray at the edges. If you sew the flowers edges it's only going to secure them more so I'd go ahead and go for it. You could test it by washing a few times but depending on how many times the quilt gets washed in the future it may or may not hold up.