Old building Beam-columns repairing work in airport Rvs waterproofing construction chemicals Application After a thorough cleaning of the reinforcements, a suitable ( non-toxic preferred) rust remover or rust converter is applied. For example - Rebaklense RR, of M/s Fosroc Chemicals India Ltd or Amandur, manufactured by GK Technocom. Some removers include a feature to prevent flash rusting which can occur to exposed bare metal. Once rust is removed, the item is rinsed thoroughly with water and dried. Nitozinc Primer is applied over all the exposed steel reinforcement rods. Then the necessary watertight shuttering is done using good quality marine plywood. An epoxy bonding agent like Nitobond EP is applied to the old concrete surface. It is for bonding new cementitious materials to existing cementitious surfaces. The new concrete should be added within 3 -6 hours of bonding agent application, i.e while it is still in a tacky state tiruchirappalli