The spray basting has never gunked up my needles or machine, I've used it for 6 years...the very first quilt class I took that was what we were told to bring to class and taught how to use it not pin basting.
Yes, I am not keen on the overspray. I put down a sheet on my kitchen floor before I put my quilt down to spray baste. That helps keep the overspray from going on my tile, cuz I hate to try to wash it off my tile. Then I throw the sheet in the laundry...no muss no fuss.
I use Sullivan's spray baste and the smell reminds me of the Easter egg dye of years ago, I like the smell but know that it isn't good to inhale. I heard there is another basting spray that has no odor and has less overspray but I don't know the name of it.
Warm quilt hugs, sue