XR-12 is a new, high-performance air-dry filler designed to tackle deeper cracks in leather. Its extra-thick viscosity makes it ideal for leveling out other air-dry fillers, providing an extremely durable and flexible repair. After the filler is fully dry, simply sand lightly with 600-grit sandpaper and apply a texture using Grain-X spray grain or Texture Paste. If needed, use XR-10 to fix any pinholes or achieve a smoother finish before adding color. XR-12 is part of our XR series of extreme repair products, designed to deliver superior results and lasting repairs.