Hobbs PolyDown would be a better choice, I think.
Not all basting sprays work well on polyester. 505 spray is one that does seem to work fine with poly battings.
Here's a link to an older thread about PolyDown:
http://www.quiltingboard.com/main-f1...s-t173513.html
Here's a link to the Hobbs site. Says quilting distance should be 4-6" max:
http://www.hobbsbondedfibers.com/products-retail.html