Originally Posted by
cannyquilter
Thank you so much for your advice. My machine does have a 9inch harp but the quilt does get a lot a pushing and pulling. I gave up on pinning because I really struggled to get fabric crease free. As I'm unpicking I'm seeing that a lot of the areas which are puckered, the stitched have run really close together so I think there is probably an issue with the quilt getting hung up as I'm manoeuvring it...
I think you've diagnosed your own problem. The quilt is catching on something, either the edge of the table, corner of the machine and/or it's not being fully supported. My guess is the backing is getting hung up. Since you are applying pressure from the top, that moves forward while the back is stuck and your walking foot helps the top to slide forward from the rest of the sandwich. After spraying, a few pins wouldn't hurt, and reassess your machine and table set up. Now that you are watching for this situation, you should have more success. Machine basting with water soluble thread and SITD around all your blocks first are also good suggestions. Please let us know how you get on.