A viscous resilient deformable grease composition having a penetration of about 250*-350 at 77*F., which develops a protective skin when exposed to air, comprising a lubricating oil having a viscosity range of 100-250 SSU at 210*F., thickened with an organophylic clay such as dimethyldioctodecyl ammonium montmorillonite, and containing a drying oil such as soya oil and a drier such as cobalt naphthenate. After homogenizing, this composition is an effective sealant, particularly for energy absorbing devices as used in automobile bumpers wherein bleeding of hydraulic fluid and moisture penetration are problems.