FIELD: chemistry.
SUBSTANCE: invention relates to thermally solidificated covering substances based on aprotic solvent. Claimed is covering substance, which contains at least one compound (A), containing hydroxyl groups, and at least one compound (B), containing isocyanate groups, and one or several components of covering substance have between 2.5 and 97.5 mole % counted per totality of structural units (I) and (II), at least one structural unit of formula 
(I), where R'=hydrogen, alkyl or cycloalkyl, and carbon chain can be interrupted by non-adjacent groups of oxygen, sulphur or NRa, with Ra= alkyl, cycloalkyl, aryl or aralkyl, X,X'=linear and/or branched alkylene or cycloalkylene residue with from 1 to 20 carbon atoms; R"= alkyl, cycloalkyl, aryl or aralkyl, and carbon chain can be interrupted by non-adjacent groups of oxygen, sulphur or NRa, with Ra= alkyl, cycloalkyl, aryl or aralkyl, n=0 to 2, m=0 to 2, m+n=2, x,y=0 to 2; and between 2.5 and 97.5 mole % counted per totality of structural units (I) and (II), at least one structural unit of formula (II), where Z=-NH-, -NR-, -O-; R=hydrogen, alkyl, cycloalkyl, aryl or aralkyl and carbon chain can be interrupted by non-adjacent groups of oxygen, sulphur or NRa, with Ra= alkyl, cycloalkyl, aryl or aralkyl, x=0 to 2, and X, R', R" have value, given above; and polyol (A) contains at least one poly(meth)acrylate polyol. Also claimed are multi-step method of applying coating with application of said covering substance, method application and versions of coating application.
EFFECT: possibility of simple obtaining of transparent varnish coatings with high resistance to crack formation under atmospheric impact and perfect resistance to scratching, which do not cause any ecological problems.
15 cl, 2 tbl, 4 ex
