Page 99 of 561

SOLUTIONS: Cast Iron Repair case 1.

In some repair situations the cast iron is so corroded and oxidized that welding cannot be done. In this kind of situations cold repairs might be the solution.

Clean surface to remove grease and accumulated dirt. Remove as much of the loose metal and oxides as possible. Thoroughly abrade the edge and the surrounding surface of the hole.

2.07

If the hole is large, a metal mesh formed to the shape of the hole should be made. Measure up and mix a small quantity of Metalgrade Express and apply it along the edge of the hole. Remember to squeeze the product hard into the surface to secure good bonding. The first thin covering acts as a "wetting layer" to improve adhesion. Place the pre cut mesh down in the hole so that it makes contact with the polymer along the edge. If needed secure it with additional polymer. Allow drying for 6 minutes (at 20°C). With the mesh securely fastened measure up and mix a sufficient quantity of Metalgrade Rebuild. Apply the product on to the mesh spreading it out evenly. Apply the product to totally encapsulate the mesh and blend it in with the Metalgrade Express already on the cast-iron edge. If the mesh size is too big, and the polymer falls trough, apply reinforcement bandage on the mesh to prevent it happening. If necessary, support the mesh by placing steel wires across the hole. The wires can be fastened to the edge by a small tack weld or by drilling a hole with slightly bigger diameter.

98