Nail Hole Damage Repair repairs nail holes that have been damaged. It cleans and flushes out the holes while hardening the inside and outside where the seam has entered and exited the hoof. It stops existing damage, holes and cracks from getting worse and getting bigger. Through the specially adapted cover, it is easy to spray the agent into the seam holes to clean and repair. Once the fluid has filled the seam hole, it begins to work and repair.