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If only a small area is damaged, patch the hole only and level it off. For large holes, patch with a strong mortar mix before applying self-leveling compound.
Dampen the hole with some glue solution made up of four parts water to one part glue.
Once the glue is tacky, press some mortar into the hole and use a gauging trowel to smooth it over.
Excerpted from Do It Yourself Home Improvement
© Dorling Kindersley Limited 2009
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