External Concrete Window Sill Repair -

: Remove all loose debris, moss, and failing paint using a wire brush or pressure washer.

: Force the repair mortar into the cavity using a margin trowel. Pack it tightly to eliminate air pockets. external concrete window sill repair

: Apply a concrete bonding agent to the dampened surface. This prevents the old concrete from sucking the moisture out of the new patch too quickly. : Remove all loose debris, moss, and failing

Concrete doesn't bond well to dry, dusty surfaces. : Remove all loose debris

Natural building shifting or poor installation can create pressure points that lead to vertical or horizontal cracks. Essential Tools and Materials