To repair water tanks, first expose the reinforcement in all damaged areas using steel wire brushes or by mechanical means. There should be at least 6mm gap behind reinforcement to facilitate cleaning, coating etc. apply a rust removing solution of Rusticide by cotton waste swab or by brush. After 24 hours apply a passivating coat of Polyalk Fixprime/cement slurry. (No water added to slurry).

Apply two more coats of similar slurry after an interval of 6 to 24 hours between two successive coats.

After interval of 4 hours :

  • Apply a priming cum bonding coat of Polyalk EP Cement slurry in 1:1 proportion (by weight) to damaged concrete surface. (No water added to slurry)

  • Immediately place Polymer modified mortar by hand mix.

  • Replaster the surface by applying bonding of Polyalk EP Cement slurry in 1:1 proportion (by weight) to the damaged concrete surface.

  • Cure the plaster as usual.

  • Inject the Polymer Cement Grout of Polyalk EP. Cement water in the proportion of 1:3:2 if required with a pressure of 2 kgs/cm2, seal the grouting nipple with polymer modified mortar.

  • Clean the surface thoroughly and moisten with water.

  • Apply a waterproofing coat of Polyalk WP/Cement slurry in proportion 1:1.25 (by weight) with brush to bottom and side of the tank.

  • Apply two more coats of similar slurry after an interval of 24 hours between two successive coats.

  • After 48 hours cure the coating by sprinkling water for 4-5 days.