Bl This standard establishes the requirements that air-drying, moisture-resistant insulating varnishes must meet, intended for use in windings, armor and similar materials, usually used to produce a surface on oven-drying varnishes that protects them. against oil, mud, metal dust and moisture and to improve its appearance. B-2 The varnishes covered by this standard are also intended for use in emergency repairs of windings, armatures, and similar materials.