Details

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For sealing cracks in concrete, bricksasbestos sheets etc :
-Clean out crack of any dust or loose material
-Fill crack with sealing compound using a knife or trowel

For stopping leak round the heads of nails on roof sheets :
-Apply a coat of sealing compound round the nail heads with a stiff brush

For repairing holes on roof sheet :
Apply a coating of sealing compound round the hole
Cover the hole with a piece of cloth
Paint over the cloth with sealing compound