I always spray mine either hanging over my deck railing with an old sheet as the backdrop to keep the dirt off the quilt and the spray off the railing, or hanging on my clothes line or a fence or my patio table. If it’s a king sized quilt top, I will fold it right sides together and drape it over whatever I’m using and essentially spray it in quadrant-like sections. Then I fold the sticky sides in and bring it back into the house. This method keeps any smell or overspray outside, eventually to be washed away by rain. The old sheet I fold sticky sides in and keep handy for the next project and wash it every so often when I have a load of wash it’ll fit in. It’s worked really well for me. I use 505 spray. I don’t spray the batting, only the top and the backing.