I'm now making great progress on quilting this quilt, but it has not been without its challenges! I was merrily quilting along, using up a half bobbin that I had and then a full one (ie. a good amount of progress!) when I took a break only to realize that I had quilted over a big fold in my backing fabric. Eeek! It was folded over about 1/4" onto itself, and probably 6-8" long. Fortunately it was at the top of the section I had completed and not smack in the middle, but let's just say my seam ripper and I got well acquainted yesterday!
I ripped out a whole bunch, tried to re-smooth and re-pin as well as I could, gave it another go (this time checking the back frequently!), and the same thing started happening in the same spot.
Hmmmm. Enter a little frustration.
Thinking about it, I started to realize that the only way to really fix this would be to re-baste it. My oldest son, being the thoughtful guy he is, helped me remove all of the pins. Then I taped the backing down as well as I could (easier said than done when a portion is already quilted), used spray to baste the batting to the backing and then still re-pinned the whole thing, using pins way closer together than I had originally done. That's where I ended off at bedtime last night.
Today I took another go at quilting and it seems to staying in place nicely. I'd say I'm nearing half way done and there's no sign of any folds or puckers, so I think I'm in the clear.
I'm still not sure why it happened but I'm thinking that perhaps free motion quilting promotes more possibility of shifting layers than using a walking foot? I also have another theory, which is difficult to describe but in my limited experience I'm thinking that you have to be more careful with FMQ designs that require you start on an edge (like this one), as opposed to designs that can be started in the middle of the quilt and then work your way out (like the spirals I did recently), which I think would redistribute any excess fabric or shifting a little better .