This multi-purpose putty is specially formulated using only the best grade linseed oil, for glazing single glass into metal, softwood and hardwood window frames. The putty is ideal for filling small imperfections (Max 5mm depth) in wood. Once dry, the filler leaves a sandable surface, which can be stained, painted, varnished or dyed, even with microporous stains. the filler is waterproof when dry and hence is suitable for exterior as well as interior applications.