Liquid Mopol (cf. J. Gniady et al., Przem. Chem., 81, 5935 (2002)) (b. similar to100degreesC, m. <-5&DEG;C, d(4)(20) 1.19-1.23 g/mL, eta(20) less than or equal to150 mPa.s, weak-bonded HCOH less than or equal to4.5%) was filtered and sprayed, 0.8-1.2 kg /Mg urea, with a 0.15 MPa dry air through a Gestra filter-equipped injecting nozzle onto a Toyo Koatsu process granulated urea to suppress (Sk = 63.1%) urea's caking tendency. To test the caking capacity, the noncoated (or Mopol-coated) granules, 5 g, were pressed (300 N) for 5 min in a 15(phi) x 50-mm cylinder. The resulting cake was taken out and crushed completely (in a hydraulic press). The pressures required to crush the coated (N-c and the noncoated (Nn-c) urea cakes were 1.29+/-0.08 and 3.50+/-0.21 N/cm(2), resp. The anticaking efficiency was expressed as Sk, % = (Nn-c - N-c)/Nn-c. In industrial trials, the coated urea did not cake when long stored in bulk or transported and was easily unloaded from freight cars. The Mopol-coating procedure is now applied at the Nitrogen Works "Kedzierzyn" (Poland) and the Mopol-coated urea meets Polish Standard PN-87/C-87011 for fertilizer grade.