I have no idea what 505 does since I don't use it. It is a chemical though and I would be leery of the effects of not washing it. I would at least let it air out some before storing it. Maybe put it on a bed for a while. I do think I would wash it to be on the safe side. Spray cans have propellants in them and you would be ready to just wrap it up when you need a verrryyyyy nicccceeeee gift. would love to see photos.