Gordon's Horse & Pony Spray protects against biting flies. This formula is an oil-based formula that gives your animal's coat a bright sheen. The gentle formula includes sunblock and offers short-term protection (3 to 14 days) depending upon the fly species. It may be applied as a fine mist with a sprayer or wiped on with a soft cloth. Kills and repels: mosquitoes, horn flies, stable flies, deer flies, face flies, horse flies and gts.