Weight plates might appear to be indestructible, but as with any other metal products, they are subject to corrosion, especially if they've been dented, damaged or left out in humid conditions. Some weight lifters like the "used" or "tough" look of a little rust or wear on their weight plates, but if the rust eats deep into the plate, it could weaken the plate so much that it could crack or break, becoming a safety hazard. While most surface dirt can be cleaned off of weight plates with a damp rag, cleaning rust off takes a little extra effort. more »