Can casting defects be repaired with "foundry iron powder"? Is the color the same as the casting?

General repair is possible, the cast iron powder with very fine net screening, to use AB glue to mix cast iron powder, evenly fill in the defect,24 hours to reach the maximum strength, but the color will be a little deeper, there is another way, is to use cast iron electrode welding repair, when the roughness after processing reaches more than 1.6 can not be seen.