I seldom use polyester batting ... but have been recently, in order to get what I had used up.
No problem using 505 .... and some has been sitting in limbo for a while now.
It keeps sticking ... and has allowed me to FMQ without any shifting.
Likewise, no problems with straight line quilting.
Or with echo quilting, around curves and such, with a straight stitch and using a foot (not FMQing).
All my experience has been with cotton fabric, no poly fabric.
I 505'd the fabric (backing or top) and not the poly batting, as I felt I had a better sense of where I was spraying plus wondered if the spray would go into the poly, rather than sit on top, waiting for the fabric to adhere.
If you ever want to adhere paper template patterns to cardstock or boxboard etc.
505 has great permanent stick-ability!!!!