A composition is described, which contains a binder on the basis of a compound having low-electron multiple carbon bonds and a carbanion-forming compound. By means of the composition according to the invention, the expansion rate of which is relatively high, coatings having the layer thickness required for the respective fire-resistance duration can be applied in simple and fast manner, wherein the layer thickness can be reduced to a minimum and nevertheless, a good fire-protection effect can be achieved. The composition according to the invention is particularly suitable for fire protection, particularly as a coating for cables and cable runs, to increase their fire-resistance period.