Wonder Putty Contractor Grade Window Glazing Compound - in Gray - is a ready-to-use oil based elastic compound specially formulated for interior or exterior use on wood, metal or aluminum sash. This non-asbestos resilient compound forms a tough, protective outer coating, yet allows expansion and contraction for normal temperature changes. Wonder Putty's excellent handling characteristics provide good elongation and knives exceptionally well. It is especially recommended for bedding and setting of glass. Additional uses include the patching of woodwork, stone, tile, concrete, and brick.