Bartoline Multi-Purpose Linseed Oil Putty is a traditional blend of high-quality linseed oil and fillers, used for generations. Specially formulated for glazing both wood and metal window frames and used by both the professional tradesman as well as the home owner. Equally useful as a general wood filler. For bedding and external fronting single glass into primed softwood and hardwood frames which will subsequently be painted. For glazing primed metal frames and single glass into concrete or stone surrounds after prior sealing with an appropriate sealer. Not for use directly against laminated glass, for bead glazing systems or on insulated glass units.