Solvent -free, matte polyurea coatings, available by means of reaction, yield at least the components:(a) Polyisocyanate -Prepolymers;(b) polyetheramine;(c) primary chain lengtheners; characterized by the coating, as a mattress, of ground carbon fibres having a medium fibre length of more than or equal to 50 m m and less than 150 m m or equal to 150 m m with a weight fraction of greater or equal 4, 5% and smaller or equal 25% and the chain extenders are selected from the group consisting of Diethylbenzyldiamine, 4,4 -methylenebis (N -secbutylcyclohexanamine),4,4 -methyldiphenyldiamine, 4,4 -methyldicyclohexanediamine, 3 -[[5 -(2 -cyanoethylamino)-1,3,3 -trime -thylcyclohexyl]methylamino]propanetitrile, 1,3 -bis (aminomethyl)cyclohexane or mixtures of at least two members of this group.
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