Abstract: A wire sealer having sufficient sealing properties and satisfactory workability of sealing treatment is provided. The wire sealer is radiation-curable, and contains the following components (A) to (C): (A) urethane (meth)acrylate; (B) a compound having one ethylenically unsaturated group and not having an anion dissociative group; and (C) a radiation polymerization initiator, wherein a cured film obtained from the radiation-curable wire sealer shows an oil absorptivity of 7% by mass or more, a water absorptivity of 10% by mass or less, and a Young's modulus of 2 to 500 MPa.

Abstract: A kit for preparing a water-sealing agent, a water-sealing material for an electrical wire, a water-sealed electrical wire, and a water-sealing method, which are used for insulated wires and the like. A kit for preparing water-sealing material for electrical wire comprising compositions (I) and (II), wherein the water-sealing material for electrical wire is prepared by mixing them in an arbitrary ratio. (I): a liquid composition containing one or more components selected from the following components (A) to (C), and (D), without containing (E). (II): a liquid composition containing one or more components selected from the following components (A) to (C), and (E), without containing (D).