Cold Water Storage Tank Repair - Birmingham This leaking cast iron cold water storage tank in the West Midlands needed complete refurbishment. As the tank was being fed by a bore hole there was plenty of sludge inside. Once the sludge was removed, we cleaned and keyed the internal surfaces by sandblasting. Removing all the rust and exposing all the underlying weaknesses with the tank. We had to use Hodge Clemcos JBlast Supa sand blasting media to get the key we needed. The keyed surfaces were primed with polyester resin. When the primer was cured we repaired all the holes and reconstructed the corroded areas using layers fibreglass matting supported by gap filling paste and a WRAS approved polyester resin. When all the repairs had been made and cured we applied the fibreglass reinforcement matting to the walls and floor area of the tank. The reconstructive fibreglass matting was impregnated with Lloyds approved polyester resin. When the fibreglass lining had cured, a polyester gel topcoat was applied to the surfaces sealing the lining and ensuring water tightness.