Baseball card corners getting damaged is a very common issue, whether it happens over time from normal wear and tear or accidentally getting bent or folded. Thankfully, there are some effective methods you can use to repair damaged corners on baseball cards and restore them to like-new condition.

The first step is to determine the type and severity of damage. Slightly bent or creased corners can often be fixed with some gentle finger or tool pressure, while more severe bends, creases or tears may require other techniques. Always examine the card closely under bright light before attempting repairs.

For minor bends, start by laying the card flat on a smooth, stable work surface. Using very light finger pressure, slowly and gently bend the creased area in the opposite direction until it lays flat again. Go slowly to avoid tearing the card stock. An alternative is to use a wooden or plastic clothes iron set on its lowest heat setting and gently press the crease with light pressure from the iron.

More severe creases may require the addition of a humidifier. Add some water to a humidifying device like a cool mist humidifier and run it until the air is noticeably more humid. Carefully place the damaged card in the humid air for 5-10 minutes. The moisture will soften the paper fibers and make the crease or bend easier to manipulate back into shape without tearing. Then slowly and gently bend or press the damaged area back into its original position.

For deep creases, folds or tears, specialized card repair supplies may be needed. Corner punch pliers can carefully punch out the damaged area and replace it with a new, undamaged piece of matching card stock. Take care to punch at the exact corner points for a seamless repair. Archival-safe adhesive like acid-free white glue can be used to adhere the replacement piece. Tape is not recommended as it can damage over time.

Corners that are separating from the rest of the card or have chunks missing require delicate reconstruction. Small tabs of matching card stock can be glued underneath for support before gluing the corner back into position. Going slowly and using minimal adhesive is key. Alternatively, professional third-party repair services exist that can expertly reconstruct severely damaged corners.

Proper storage is important after any repair work. Sleeves, toploaders and binders/pages provide protection from future bending or abrasion. Storing in a cool, dry area away from direct sunlight also helps prevent further deterioration over time. With patience and care, nearly any baseball card corner damage can be successfully repaired. Taking your time and using the gentlest methods possible will give the best, longest-lasting results.