Endure Sweat-Resistant Fly Spray is a ready-to-use liquid insecticide and repellent formulated for horses exposed to biting and nuisance insects during turnout, training or competition. Its water-based formula uses RepeLock conditioner, which binds to the hair shaft so protection continues even when the horse sweats or is caught in the rain, and it leaves no greasy or oily residue on the coat. The spray can be applied over the body or used as a wipe-on treatment for sensitive areas such as the face, ears and legs. Before application, the horse's coat should be brushed to remove loose dirt and debris, and a dirty coat should be shampooed, rinsed and fully dried first. The bottle should be shaken well before each use and stored in a cool, dry place away from direct sunlight. Reapplication is typically needed more frequently at first, tapering to a longer interval as protection builds, and again after bathing or heavy rain.