Hydraulic binder having an even and complete coating, which can be obtained by applying a coating agent, which comprises one or more compounds from the group (A-1) to (A-9), to a hydraulic binder which is selected from cements and calcium sulphate binders, wherein the hydraulic binder is presented in the mixing unit in powder form and the coating agent is sprayed in the liquid state at a temperature between room temperature and 160°C, wherein the choice of temperature depends on the compounds used: (A-1) amines NR 1 R 2 R 3, wherein R 1 is a C 6-40 hydrocarbon group and R 2 and R 3 independently of one another are hydrogen or a C 1-40 hydrocarbon group, and/or salts thereof; (A-2) polyamines R 1 -[NH-CH 2 -CH 2 -CH 2] n -NH 2 where n=1-5 and/or salts thereof, wherein R 1 is as defined above; (A-3) quaternary ammonium salts [NR 1 R 2 R 3 R 4] + X n- 1/n, wherein R 1, R 2 and R 3 are as defined above, R 4 is a C 1 - 6 alkyl group and X n- is an anion; (A-4) fatty acid salts of multivalent metal ions; (A-5) fatty acid mixtures which contain at least one saturated and one unsaturated fatty acid and/or salts thereof. (A-6) silanes of the type (R 5 O) 3 Si-R 6, wherein R 5 is a C 1-6 alkyl group and R 6 is a C 4-30 hydrocarbon group or a group of the formula -(CH 2) n -Y where n=0-3, wherein Y represents a methacrylic group or a vinyl group, or, if R 6 is -(CH 2) n -Y, also oligomers of the silane; (A-7) silazanes of the type R 7 3 Si-NH-SiR 7 3, wherein R 7 is a C 1-6 alkyl group; (A-8) polysiloxanes which contain at least one SiH bond. (A-9) titanium compounds TiY 1 Y 2 Y 3 Y 4, wherein the Y 1, Y 2, Y 3 and Y 4 are the same or different and are selected from saturated or unsaturated hydrocarbon groups having 1-30 carbon atoms, saturated or unsaturated carboxylic acid groups, C 1 -C 30 alkoxy groups and di-(C 1 -C 30 alkyl) phosphate groups. (A-1) amines NR 1 R 2 R 3, wherein R 1 is a C 6-40 hydrocarbon group and R 2 and R 3 independently of one another are hydrogen or a C 1-40 hydrocarbon group, and/or salts thereof; (A-2) polyamines R 1 -[NH-CH 2 -CH 2 -CH 2] n -NH 2 where n=1-5 and/or salts thereof, wherein R 1 is as defined above; (A-3) quaternary ammonium salts [NR 1 R 2 R 3 R 4] + X n- 1/n, wherein R 1, R 2 and R 3 are as defined above, R 4 is a C 1 - 6 alkyl group and X n- is an anion; (A-4) fatty acid salts of multivalent metal ions; (A-5) fatty acid mixtures which contain at least one saturated and one unsaturated fatty acid and/or salts thereof. (A-6) silanes of the type (R 5 O) 3 Si-R 6, wherein R 5 is a C 1-6 alkyl group and R 6 is a C 4-30 hydrocarbon group or a group of the formula -(CH 2) n -Y where n=0-3, wherein Y represents a methacrylic group or a vinyl group, or, if R 6 is -(CH 2) n -Y, also oligomers of the silane; (A-7) silazanes of the type R 7 3 Si-NH-SiR 7 3, wherein R 7 is a C 1-6 alkyl group; (A-8) polysiloxanes which contain at least one SiH bond. (A-9) titanium compounds TiY 1 Y 2 Y 3 Y 4, wherein the Y 1, Y 2, Y 3 and Y 4 are the same or different and are selected from saturated or unsaturated hydrocarbon groups having 1-30 carbon atoms, saturated or unsaturated carboxylic acid groups, C 1 -C 30 alkoxy groups and di-(C 1 -C 30 alkyl) phosphate groups.