As a Logia, this fruit allows the user to turn their body into a sticky substance, making them nigh-invulnerable unless Haki or Seastone is used. The substance is thick enough to be used as a large blunt weapon, and is capable of trapping people, even extremely strong ones, due to its stickiness, especially if empowered by Busoshoku Haki.
However, one can be freed from the substance should a sufficient amount of water be applied to it, Fishman Karate being especially effective. Otherwise, the user is affected by the standard Devil Fruit weaknesses.
Katakuri uses his fruit in combat, and is capable of controlling large amounts of the substance with high precision. So far he has been shown turning his leg into it and extending it out extremely fast to form a large, tentacle-like blunt weapon, with much of it imbued with Haki to harm the rubber-bodied Monkey D. Luffy, and at the same time, entrapping him.