TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The highly absorbing material contains one or more Ru compounds, where the highly absorbing material ranges from 7 to 30% weight. The Ru compound is selected from ruthenium oxide (RuO2), barium ruthenium oxide (BaRuO3), and pyrochlore-like Ru compounds, or its mixtures. The inorganic glass binder is selected from boroaluminosilicates of sodium (Na), potassium (K), lithium (Li), calcium (Ca), strontium (Sr), magnesium (Mg), barium (Ba), with or without transition metals oxides. The precursor of the silicon dioxide binder is a silicon resin selected from polydimethylsiloxanes, polymethydro-dimethylsiloxane copolymer, vinyl terminated silicone polymers and vinyl backbone silicone polymers. The liquid organic vehicle is selected from aliphatic alcohols or esters, terpens, terpineols, solutions of resins. The composition is in the form of a paste or paint. The metal substrate is selected from a solar tower coated parts which are exposed to concentrated solar power, a trough pipe, a Stirling engine or a domestic solar collector. It is composed of a carbon steel, stainless steel, Inconel and super alloys. Preferred Composition: The inorganic glass binder or the precursor ranges from 15 to 55% weight. The liquid organic vehicle ranges from 25% weight to 50% weight of the total weight of the composition. The amount of the ceramic filler ranges from 0.1% weight to 30% weight of the total weight of solids dispersed in the composition. The composition comprises from 1 to 99.5% weight RuO2, from 5 to 80% weight glass particles, from 0.1% weight to 30% weight of the ceramic filler and from 10% weight to 50% weight of the liquid organic vehicle. Ceramic filler contains from 0.1 to 12.0% weight cobalt oxide (Co3O4); from 0.1 to 12.0% weight niobium pentoxide (Nb2O5); and from 0 to 12.0% weight zirconium dioxide (ZrO2). It optionally further contains up to 20% silver powder. Preferred Method: In coating metal substrate, heating is conducted by firing the composition; heating is conducted by naturally curing the composition; or heating is conducted at a temperature which is lower than 750 degrees C. EXAMPLE - No suitable example given.