If, at any time, the Seller believes that the molds may not be completed on the completion date specified in the purchase order of the manufacturing molds, Seller shall issue a letter informing Purchaser as soon as possible. Delivery of the said letter does not release Seller from its obligation to complete the mold on the completion date or liability for additional expenses incurred to Seller or Purchaser resulting from any delay unless Purchaser agrees otherwise in writing.