How much repositioning? Taking the whole thing apart and moving things or a bit of shifting because you found a wrinkle later on. The spray glue is not permanent, so there is always the potential for repositioning. Yet, it also holds well over time. I can attest to this as I spray basted a king-sized quilt and then had to store it before finishing the quilting. Rolled up in a closet for months, I took it out and basted with nothing out of place.