Langlow Ultra-Light Lightweight Filler fills in gaps, cracks and indentation in vertical and overhead structures Consistent finish - Ultra-Light Lightweight Filler contains high-strength glass microspheres that provide an instant non-shrink surface that can be further smoothed off Does not need to be sanded Smooth surface in a single application Easy application- Ultra-Light Lightweight Filler comes in a low density mixture that is easy to apply No special tools or techniques are needed