The present invention relates to a thermal emissivity coating composition comprising: a) an emissivity agent in an amount from 30 to 65% by weight with respect to the total weight of the thermal emissivity coating composition; b) a filler selected from the group consisting of oxides of aluminum, silicon, magnesium, calcium, boron and mixtures of two or more thereof, in an amount from 10 to 35 wt % with respect to the total weight of the thermal emissivity coating composition; and c) a binder in an amount from 12 to 52 wt % with respect to the total weight of the thermal emissivity coating composition; wherein the emissivity agent comprises cobalt oxide in an amount from 10 to 25 wt %, preferably 12 to 25 wt % with respect to the total weight of the thermal emissivity coating composition and further comprises chromium oxide and titanium oxide.