I use poly batting all the time and have not had any problems with the basting spray. I still use a few pins probably 8-10 inches apart but I really don't know if I need them or not (just me and my insecurity I guess LOL). I've also hand-quilted after using the spray and I don't have a problem-no gummy needle, needle goes through easily, etc. Hopes this helps-this is just my experience, others may have different comments.