Once the patch is fully cured:
Concrete window sills are durable, but they are constantly exposed to the elements. Over time, freeze-thaw cycles, moisture intrusion, and settling can cause cracks, spalling (chipping or flaking), or crumbling edges. how to repair a concrete window sill
: Use rough-grit sandpaper to even out the surface. Once the patch is fully cured: Concrete window
: Place these along the crack, spaced about 1/2 inch to 1 inch apart. and settling can cause cracks