1. An apparatus comprising:a depositing mechanism to perform an overcoat depositing operation, the depositing mechanism comprising a plurality of print head arrays each being arrangeable in a deposit position to deposit an overcoat layer onto a substrate and a service position to enable servicing to be performed; and
an array controller to cause a first print head array of the plurality of print head arrays to be moved periodically from the deposit position to the service position according to a predefined servicing sequence during an ongoing overcoat depositing operation performed by the depositing mechanism;
wherein the array controller moves the first print head array from the deposit position to the service position based on a predefined service interval over which the first print head array is able to deposit an overcoat fluid to form the overcoat layer without clogging occurring; and
wherein the predefined servicing sequence has the first print head array active at the deposit position for twice as long a period of time as the first print head is being serviced at the service position.