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Surface water film dynamics is recognized as playing an important role in the glaze ice accretion process. The solution, in general scaling problems, requires the match of all the relevant non-dimensional parameters to take place individually. However, in water film dynamics similarity, we encounter that is not possible for both Reynolds and Weber numbers to be matched simultaneously, and the strict individual parameter similarity condition has to be relaxed and combination of parameters accepted as a reasonable compromise. In this paper, a film Weber number will be defined and then proposed as a similarity parameter along with the non-dimensional film thickness as well as others that have been long recognized as well established, to form the set of equations that determine the scaled variables in terms of the reference ones.