Detect-Her Tail Paint is by far the easiest tail-marking product to interpret. When a cow is in heat, Detect-Her will rub off after several mounts, which makes interpretation of standing heat straightforward and accurate. The paint can be re-applied as often as needed to maintain visibility yet still rubs off easily. Contains Bitterguard™ to deter licking. Non-hazardous water-based paint is packaged in a pocket-size 12-oz. applicator bottle with brush cap that makes application easy on either short- or long-haired cows.