Do I need a special "quilting foot"? Don't want to ruin quilt. Afraid layers will shift. Spray basting already coming loose.
Welcome to the Quilting Board!

Do I need a special "quilting foot"? Don't want to ruin quilt. Afraid layers will shift. Spray basting already coming loose.
Life may not be the party you expected it to be, but while you're here you might as well dance!
Depends on what you are going to do...straight line- walking foot.........FM- darning foot or hopping foot.......practice on small sandwich....... Check the tutes here for more info
I would feel safer thread basting or pinning rather than spray basting....JMHO
You should put together some small practice pieces & do a lot of practicing Before attempting to quilt your ( real) quilt. Walking foot for straight line quilting * stitch in ditch, cross hatch, gentle curves*
Hopping foot for free motion. Both take some practice. Walking foot works with your feed dogs, free motion quilting is done with feed dogs down so you can ( freely) control moving the fabric.
There are many utube videos, tutorials to watch, help you see the process.
hiding away in my stash where i'm warm, safe and happy
My fusible batting didn't stick and I ended up with loads of pins in my quilt that I'm working on to try to keep it together. It will be awful to work on if it's coming apart. My machine has a few different feet for fmq and each one feels different. I would practice before you get to a real quilt too. My first efforts were ugly.
Okay, I use a walkingfoot and stitch in the ditch, shadow the outline of the block or go across the blocks. I also usually do my in 3 sections so that it is manageable on my home sewing machine. I have several machines from a Featherweight to the Singer Anniversary machine plus several in-between and have walking feet that work on all of them. Here are some pictures that might help including the finished quilt.
Busy in Ohio
Your quilt is very beautiful!
Lots of great advice about the feet you can use. If your spray basting is coming loose you can pull the layers loose & lightly spray again. I have had edges & corners come loose because I didn't spray far enough to the edges so I just did another quick spray. I have also had a quilt sprayed, layered & left rolled up for a few months. Everything was still stuck in place. Good Luck!
Pretty quilt!
A quilt is like a good life. It's full of mistakes, but, in the end, it looks pretty good.
I would also second CKCOWL's advice: don't practice on a real quilt! Make sure you feel comfortable quilting using a scrap sandwich. If your spray basting is coming loose thru just handling, I wouldn't trust it and would also pin.
Use a walking foot for straight lines & gentle curves and you would need a hopping foot, FMQ foot OR darning foot for free motion quilting.
"I do not understand how anyone can live without one small place of enchantment to turn to."
Marjorie Kinnan Rawlings
I always encourage newbie quilters to practice on something like quilts for a dog shelter. The dogs get something comfortable to lie on and you get the practice. The dogs won't tell the quilt police about how well the quilt was quilted.
A Good Friend, like an old quilt, is both a Treasure and a Comfort