NOVELTY - Coating method for preventing bending phenomenon of substrate (AA) involves forming two or more coating layers (BB,CC) by coating the surface of a substrate with coating composition having different densities, and forming at least one layer among the two or more coating layers by coating a coating composition containing a silsesquioxane composite polymer (I)-(IX) and curing the coated product.    USE - Coating method for preventing bending phenomenon of substrate used in articles e.g. window cover substrate of display, wall material, floor material, tile, roofing material, window of building, timber public facilities, timber accessory, wood furniture, protective plate, optical product, electronic product, solar cell, automobiles, semiconductor manufacturing apparatus, and kitchen utensils.    ADVANTAGE - The method provides coated substrate having high surface hardness, excellent bending resistance, transparency, scratch resistance, water resistance, anti-fouling characteristics, anti-fingerprint property, thermal stability and glossiness.    DETAILED DESCRIPTION - Coating method for preventing bending phenomenon of substrate involves forming two or more coating layers by coating the surface of a substrate with coating composition having different densities, and forming at least one layer among the two or more coating layers by coating a coating composition containing a silsesquioxane composite polymer of formulae (I)-(IX) and curing the coated product.    A=group of formula (i);    B'=group of formula (ii);    D'=group of formula (iii);    E'=group of formula (iv);    Y'=O, NR21, ((SiO3/2R)4+2nO) or ((SiO3/2R)4+2nO);    X=R22, ((SiO3/2R)4+2nR) or ((SiO3/2R)4+2nR);    R,R1-R22=H, D, halo, amino, epoxy, epoxycyclohexyl, (meth)acryl, thio, isocyanato, nitrile, nitro, or phenyl, 3-40C arylthio, 3-40C aryloxy, 3-40C aralkyl, 3-40C heteroaryl, 6-40C aryl, 3-40C heterocycloalkyl, 3-40C cycloalkyl, 1-40C alkoxy, 2-40C alkenyl or 1-40C alkyl (all optionally substituted);    a,d=1-100000;    b=1-500;    e=1 or 2;and    n=1-20.    INDEPENDENT CLAIMS are included for the following:    (1) coating composition, which comprises the silsesquioxane complex polymer, organic solvent and initiator;    (2) coated substrate; and    (3) article, which includes the coated substrate.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the coated substrate. (Drawing includes non-English language text)    Substrate (AA)    Coating layers (BB,CC)