I did use a walking foot which helped the fabric move, but still happened. Wouldn't pressing it after spray basting mash down the padding inside?

Very good Pam, but where on the quilt sandwich so you inject it?

You have to remember to tighten your back as you quilt, I always give my back a little(gentle) tug to make sure that it is also laying flat. But, with the spray starch I have had no problems. Oh yeah, I use Ti pins to pin it to my floor with a little bit of a stretch on it.

I have learned so much from these postings. I feel relieved that I am not the only one that gets puckers. Just learned about the 505 spray and if it works, it will save me from a lot of back pain. Thank you everyone for being honest and willing to teach others.

Is this going corner to corner stretch may be coming from bias stretch, have never used spray but lots of pins or loose baste to keep in place. :)

Good point...stitching diagonally can stretch both fabric and batting and it is easy to get puckers when you do. One way to help with that is to do all your horizontal and vertical stitching first, then go to the diagonal stitching.

Thanks for all the advise. I was trying to save time by using the spray baste but next time, i'll use it with pinning as well.:)