Scratch and mar resistant automotive coatings

A method to coat a substrate, comprising:

• i) preparing a 2K coating composition by combining and mixing an epoxy component (A), comprising:
• an epoxy resin, wherein the epoxy resin is an acrylic resin having an epoxy group in a side chain;
• a solvent;
• at least one compound of formula (I):
• [(ER)x(R′O)y(HO)z(R″)t(SiO(4-x-y-z-t))]m (I)
• wherein
• ER is an alkyl group substituted with an epoxide group or a cycloalkyl group substituted with an epoxide group,
• R′ is an alkyl group of 1 to 6 carbon atoms,
• R″ is an alkyl group of 1 to 20 carbon atoms which may be linear, branched or cyclic,
• x is a number from 0 to 2,
• y is a number from 0 to 4,
• z is a number from 0 to 3,
• t is a number from 0 to 2,
• at least one of x and y is greater than 0,
• x+y+z+t=4, and
• m is =1, and/or oligomer or polymer compounds of the compound of formula (I), wherein partial hydrolysis and condensation provides structures containing epoxy side chains (ER), said structures containing up to 5000 monomeric units m;
• and
• optionally, at least one additive;
• and
• an acid resin component (B), comprising:
• a carboxylic acid resin including carboxylic acid groups;
• a solvent;
• optionally, at least one catalyst;
• and
• optionally, at least one additive;
• ii) applying the 2K coating composition to the substrate;
• and
• iii) drying and curing the applied composition on the substrate.