Carr & Day & Martin Cornucrescine Hoof Barrier. Carr & Day & Martin Cornucrescine Hoof Barrier strengthens and supports hoof structure to help improve health and shoe retention. Cornucrescine Hoof Barrier creates a \\\'one way barrier\\\' to protect the hoof from excessive absorption of water and urine. Cornucrescine Hoof Barrier waterproofs the hoof but also allows it to breathe naturally and repel moisture, and contains an anti-bacterial agents to help protect against infection. Carr & Day & Martin Cornucrescine Hoof Barrier is suitable for soft and crumbly hooves and ideal for everyday use. Integral brush for easy application.