Hardener, only for use with Hardener, only suitable for use PU primer 2 154 394. with PU primer 2 154 394. Important! Important notice! This part can only be stored for a limited time. This part has a limited shelf life. Please refer to the expiry date on Please observe the expiration date the part label. indicated on the label. Exception: Paint materials, see Painting Handbook Painting materials, see Painting Manual 'BMW Group Original ColorSystem' ***** *****