A super strength contractors grade filler fortified with strands of fiberglass for superior bonding. Rebuilds damaged and rotted wood, metal and fiberglass. Excellent for masonry repairs to steps, porches and foundations. Offers high build capabilities with excellent adhesion. Hangs well on vertical surfaces. Formulated to withstand outdoor conditions. This filler can be routed and shaped to desired contour. Will not shrink, crack or crumble and may be painted or tinted.