n (1) In experimental or test work, performance of the experiment or test at one set of experimental factors. (2) Resin flow down the vertical or sloping surface of a sprayed-up or laid-up reinforced-plastic fabrication before it can be cured (usually unwanted). (3) Narrow downward movement of a paint or varnish film; may be caused by the collection of excess quantities of paint at irregularities in the surface, e.g., cracks, holds, etc., the excess material continuing to flow after the surrounding surface has set. Sometimes called Tear. (4) See Running.