I have a Bernina 820 and I used the basting spray on my last four quilts -- 2 queen size and 2 nap size. I used June Tailor on the first one and it did gum up the needle some, but I used 505 on the others and the needle didn't gum up at all. I think I probably sprayed the first one too heavily, too. There were a lot less fumes with the 505 brand. I'm definitely a convert.