Repair concrete window sills hi i have a concrete window sills which have some weathering damage on top.
Concrete window sill repair.
Use a paintbrush to apply concrete bonding agent to the entire window sill.
Rub off flaking paint or loose concrete along the crack with the wire brush and make sure to clean out any moss that may be growing inside.
Apply a 3 8 inch thick layer of concrete all over the sill with a trowel following any contours to mimic its original shape.
Masonry window sill repair after removing the loose material and got it clean i used toupret touppreith f in several layers its not cheap but it hold.
Your sill probably isn t this fancy.
At one spot there is a circa 10cm by 6cm section where the concrete is crumbling away to depth of maybe 1cm in the middle of the area.
Resurface stained or cracked concrete window sills with new concrete.
As this may.