Okay, I just got my latest can. This one is called 'Quilt Basting Spray' by June Tailor. It also says use in well ventilated room, but nothing about windows being open. I supose that any heated room would be ventilated, like with the cold air return on the furnace. I don't think using bursts of temp spray adhesive would be harmful, but do protect surounding area from the spray. I think any aerosol spray needs to be used in a well ventilated area. possibley due to the propellent. I think that the 505 is a pump spray, so may be a safer product. I would be curious if anyone else can enlighten us.