Anti-climb paint (also known as Anti Vandal Paint) is a class of paint which is a thick glutinous coating that is applied with a stiff brush, trowel or by hand using a protective glove. In appearance it is similar to smooth gloss paint when applied but it remains slippery indefinitely so preventing any intruder from gaining a foothold. It is used to prevent climbing on objects such as lampposts, walls and fences. It owes its effectiveness to the fact that it is based on a non-drying oil and 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 intruders to be identified.
The Daily Omnivore 