I don't like the sulky spray adhesive as it takes a lot to hold, or else the layers won't stay together long enough. Some one mentioned the 505 spray which I havenot used. Does anyone have any experience with this one?:)

i have used 505 for about 3 years and never had a problem with it

I can't imagine spray basting having anything to do with broken threads or skipped stitching. If you use way too much spray your needle can get gummed up and needing to be cleaned or changed. But spray basting correctly should not cause any of the problems you are experiencing. Rethreading, tension adjustment and possibly fabric choices would be the first things I would choose for those problems.

While we're on the subject of basting spray, my spray, Sullivan's, works great but the fumes are so vile I have to use it in the garage. Is there a spray that i could use in the house?