A sealer to bond film having a high temperature resistance (e.g., ceramic) substrate with properly sized groove receiving a heater element as in a flat faced wire band in a tight, flush to adjacent film presentation surface arrangement. A stacked ceramic plate set with wire band within a groove defined by an intermediate stack insert is a suitable substrate. The band is retained flush by a positioner securely locking down one end while the other end is provided at a housing body access location. The sealer is suited for use as a product-in-bag sealing device (products such as air, foam, foodstuff, etc.) with the heater element in contact with film to form a seal. A drag seal arrangement, where film layers are drawn past a fixed or adjustably mounted heater element is an example.