Abstract: A testing device is capable of automatically performing a uniform and accurate test to determine the cure of a film of paint or the like on a test panel. The tester includes a powered rub weight wrapped, at its point of contact with the panel, with a solvent saturated material that rubs on the panel as the weight is caused to move back-and-forth along the painted surface. A drive mechanism shifts the rub weight, which is of a predetermined weight, at a constant length and speed of stroke and a counter records the number of strokes required for the solvent to penetrate the film.