It is a foam that is close to or past the shelf life, suitable for use in installation work. As long as the foam moves in the bottle, it is usable. When installing, moisten the surfaces so that the foam molecule can expand better. Do not leave the foam in the hands of minus degrees, it makes the foam partially or completely unusable. A good way to save costs is to use this foam. If the foam should not come out of the bottle, we will exchange it for a new bottle free of charge.