1. If the sale is for a sum greater than the amount of the lien, any excess shall be paid to the customer and any prior lienholder. In the event that the proceeds of the sale are insufficient to satisfy the lien, the plastic fabricator shall be entitled to a personal judgment for the deficiency against the customer.

2. No sale shall be made under sections 430.400 to 430.407 if it would be in violation of any right of a customer under federal patent or copyright law, but the judge may order the customer to fully satisfy his indebtedness to the plastic fabricator prior to release of the mold to the customer.