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A method for providing a ceramic coating on a ceramic or metallic substrate and the ceramic coating composition useful therein. The coating composition comprises a putty-like material comprising a colloidal silica, a base for gelling the silica, a filler, and no more than 50 wt. % of a volatile solv

A method for providing a ceramic coating on a ceramic or metallic substrate and the ceramic coating composition useful therein. The coating composition comprises a putty-like material comprising a colloidal silica, a base for gelling the silica, a filler, and no more than 50 wt. % of a volatile solvent or solvents. The putty-like material is rolled onto the desired substrate and cured to form a protective ceramic coating of any desired thickness. The cured coating may be fired, if desired.

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A method for applying a ceramic coating to a ceramic or metallic substrate, comprising: (a) forming a sol of a colloidal silica dispersed in a polar organic solvent; (b) adding a base to the sol in an amount of from 0.1 to 1.0 mole per mole of the colloidal silica, to produce a corresponding silica

A method for applying a ceramic coating to a ceramic or metallic substrate, comprising: (a) forming a sol of a colloidal silica dispersed in a polar organic solvent; (b) adding a base to the sol in an amount of from 0.1 to 1.0 mole per mole of the colloidal silica, to produce a corresponding silica gel; (c) adding at least one filler to the silica sol formed in step (a), or to the silica gel formed in step (b), in an amount of about 2 to 20 times the weight of the colloidal silica, wherein the filler is a ceramic, glass, metallic, polymeric or carbonaceous filler material, or a mixture thereof; (d) mixing the sol or gel after addition of the filler in step (c) to thoroughly disperse the filler therein; (e) at least partially drying the filler-containing silica gel to form a coating composition in the form of a paste, said composition incorporating no more than 50 wt. % of volatile solvents; (f) applying the coating composition to a ceramic or metallic substrate; and (g) curing the coated substrate to form the ceramic coating thereon.