Delaware Code
Part 5. Performance
§ 2-508. Cure by seller of improper tender or delivery; replacement.

(1) Where any tender or delivery by the seller is rejected because non-conforming and the time for performance has not yet expired, the seller may seasonably notify the buyer of his or her intention to cure and may then within the contract time make a conforming delivery.
(2) Where the buyer rejects a non-conforming tender which the seller had reasonable grounds to believe would be acceptable with or without money allowance the seller may if he or she seasonably notifies the buyer have a further reasonable time to substitute a conforming tender.