disclosed is a process for preparing an ink jet printhead which comprises : providing a diaphragm plate having a plurality of piezoelectric transducers bonded thereto ; aligning an electrical circuit board having a fill joint with the piezoelectric transducers and temporarily attaching the electrical circuit board to the piezoelectric transducers , thereby creating a layered structure having interstitial spaces between the diaphragm plate , the piezoelectric transducers , and the electrical circuit board ; applying a thermoset polymer through the fill joint and allowing it to fill the interstitial spaces via capillary action ; and curing the thermoset polymer to form an interstitial polymer layer .