Abstract: The invention relates to a film having two major, opposing surfaces and impressments at both opposing surfaces. The film is useful as a liner, especially a waterproof liner such as a shower pan liner. The impressments take the form of at least a line, an indicium, or both. The lines can be rectilinear, curvilinear, or a combination of both in random or organized segments and can be measured in any system of units or combination of units. The indicia impressed at each surface of the waterproof liner can be in the same or different languages.