What is the best method of repairing deep holes in concrete walls and ceilings?
Prepare hole with bonding agent: apply a firm but tacky high build mortar to a sized sheet of plastic and push the mortar into the hole with your hands, then trowel into level shape. This plastic sheet acts like a solid sheet of formwork and prevents the mortar from falling out. Allow the material to harden for approx 3 hours then remove plastic sheet and trim protruding material : upon mortar curing complete repair with faring coat mortar and smooth patch finish. [Handy hint] This technique is also recommended for drywall repairs.
