Anti-Climb Fence

Anti-Climb Paint (also known as Anti-Vandal Paint) is the term for a class of paint which is highly thixotropic and is
often used to prevent climbing of objects such as lamp posts,
walls or fences. It is effective because it is based on a non-drying oil which keeps the surface greasy and slippery. As
an additional advantage, it leaves its mark on the person touching it and hence makes it possible for people to identify intruders.