Composition

A process for coating a substrate with a coating composition, said process comprising applying said composition to the surface of said substrate, wherein said coating composition has a volume solids content of greater than 30%, said composition comprising:

• (i) at least one polycarbonate polyol;
• (ii) at least one hydroxyl containing polymer selected from the group consisting of an acrylic polyol a polyester polyol and a mixture thereof and
• (iii) at least one polvisocvanate curing agent:
• wherein the weight ratio of (i):(ii) is 9:1 to 1:9 and wherein, if present, said polyester polyol is different to said polycarbonate polyol:
• and
• wherein the substrate is selected from the group consisting of aircraft wings, wind turbine blades, rotor blades, propellers;
• randomes, antenaae, fan blade nose cones and high speed vehicles.

A coating composition having volume solids content of greater than 60%, said composition comprising:

• (i) at least one polycarbonate polyol;
• (ii) at least one hydroxyl containing polymer selected from the group consisting of an acrylic polyol, a polyester polyol and a mixture thereof;
• and
• (iii) at least one polyisocyanate curing agent;
• wherein the weight ratio of (i):(ii) is 9:1 to 1:9 and wherein, if present, said polyester polyol is different to said polycarbonate polyol.