Clean the surface around the crack to remove dust, dirt, and any loose particles. Use a putty knife or spatula to apply Crack X Paste into the crack, ensuring it is filled completely. Smooth the surface evenly to match the surrounding area and avoid excess paste. Allow the paste to dry for 1–2 hours, or until it is touch dry. Once dry, sand the surface to achieve a smooth, level finish if necessary. If required, apply a second layer to fill deeper cracks and repeat the drying and sanding process. Once the surface is smooth and fully dried, proceed with painting or finishing as desired.