I love the 505 spray but have never used it on a bed sized quilt. The largest I've done is a lap quilt 60x72 and it washed fine. I have used it a lot on table runners and placemats but have not washed it out. Joann's online has it on sale for 50% off quite often. I usually stock up then. I spread a disposable tablecloth from the dollar store on a large table and spray in my basement in the winter; do it outside in the summer. There's no smell.