When processing panels through my horizontal conveyorised etching machine puddles are forming on the surface of the panel being processed is there a way of preventing this from occuring as I results in uneven etching

The best away of preventing puddle formation is to use a spray etching machine with Horizontal Oscillation this will greatly minimise any puddle formation, which results in blocking oxygen contact with the Etchant as it is working on the material.  This in turn can result in uneven etching.