NOVELTY - A curable composition comprises: at least one aromatic epoxy resin; at least one curing agent for curing the aromatic epoxy resin, where the curing agent comprises at least one cycloaliphatic amine; at least one fatty acid polyamide having a melting point of 100-145 degrees C; and at least one filler material comprising hollow particles.    USE - For coating substrate and article which is component of wing, fin, rotor blade, and flap of wing of aircraft (claimed); for coating external surfaces of articles including external part of aircraft, wind power station, rotor blades of wind turbines and helicopters; as fillers or adhesives for components in the transportation industries.    ADVANTAGE - The curable composition has an extrusion rate of 10-50 g/minute when being extruded at 23 degrees C and a pressure of 5 bar for 60 seconds through a circular aperture having a diameter of 4.0 mm; has low density and exhibit advantageous mechanical properties evaluated, e.g. in terms of compressive strength, has good compressive strength at room temperature but also at elevated temperatures; has a low water uptake; and provides coating having a density of 0.4-0.6 g/cm3, a compression strength of 22-32 MPa at 23 degrees C, a water uptake of less than 10 wt.% after 1000 hours immersion in water at 23 degrees C. The curable composition shows a significant reduced water uptake, therefore advantageously used on exterior areas, i.e. areas where the cured composition are exposed to moisture and where weight increase by water uptake is to be reduced.    DETAILED DESCRIPTION - A curable composition comprises: at least one aromatic epoxy resin; at least one curing agent for curing the aromatic epoxy resin, where the curing agent comprises at least one cycloaliphatic amine; at least one fatty acid polyamide having a melting point of 100-145 degrees C, where the fatty acid polyamide contains at least two end-groups of formula -NR'a-CO-R'b; and at least one filler material comprising hollow particles.    R'a=H or 1-4C alkyl;    R'b=(un)saturated 3-27C alkyl chain.    INDEPENDENT CLAIMS are included for the following:    (1) a coating comprising the reaction product of the curing reaction of the curable composition;    (2) method of coating a substrate involves: applying the curable composition to the substrate; and subjecting the curable composition to curing; and    (3) an article having an external surface, where the surface comprises the coating, where the article is a component of a transport vehicle or a wind energy-generating device, where the external surface of the article forms part of the external surface of the transport vehicle or the wind energy-generating device when installed in it.