Disclosed is a method for producing coated substrates, wherein a first aqueous suspension and a second aqueous suspension are produced, a layer of the first aqueous suspension is applied onto a substrate, a layer of the second aqueous suspension is applied onto the layer of the first aqueous suspension applied onto the substrate, and the resulting substrate coated is sintered. The first and second aqueous suspensions each contains a refractory metal carbide, a sinter additive and water. Additionally, the second aqueous suspension can contain a sinter additive, wherein the content by weight percentage of the sinter additive in the second aqueous suspension, based on the total weight of the second aqueous suspension, is less than the content by weight percentage of the sinter additive in the first aqueous suspension, based on the total weight of the first aqueous suspension. Also disclosed are a coated substrate produced using the method and the use of the coated substrate.