A method comprising: identifying a damaged area in an abradable coating of an in-service component, wherein the abradable coating is on a substrate of the in-service component; applying a restoration slurry to the damaged area of the abradable coating, wherein the restoration slurry comprises a liquid carrier, a fugitive material comprising graphite, and a restoration coating material, and wherein the restoration coating material comprises at least two of mullite, a rare earth silicate, a rare earth oxide, alumina, zirconia, hafnia, ZrSiO 4, HfSiO 4, TiO 2, Ta 2 O 5, carbon, boron oxide, borosilicate, alkali metal oxide, alkali earth metal oxide, silicon, silicon alloy, aluminum, boron, germanium, silica, barium strontium aluminosilicate, barium aluminosilicate, calcium aluminosilicate, magnesium aluminosilicate, or lithium aluminosilicate; drying the restoration slurry to form a dried restoration slurry; and heat treating the dried restoration slurry to cause reaction between the at least two of mullite, a rare earth silicate, a rare earth oxide, alumina, zirconia, hafnia, ZrSiO 4, HfSiO 4, TiO 2, Ta 2 O 5, carbon, boron oxide, borosilicate, alkali metal oxide, alkali earth metal oxide, silicon, silicon alloy, aluminum, boron, germanium, silica, barium strontium aluminosilicate, barium aluminosilicate, calcium aluminosilicate, magnesium aluminosilicate, or lithium aluminosilicate to form a restored portion of the abradable coating comprising a glass phase in the restored portion and to evaporate or burn off the fugitive material comprising graphite to form porosity in the restored portion of the abradable coating. identifying a damaged area in an abradable coating of an in-service component, wherein the abradable coating is on a substrate of the in-service component; applying a restoration slurry to the damaged area of the abradable coating, wherein the restoration slurry comprises a liquid carrier, a fugitive material comprising graphite, and a restoration coating material, and wherein the restoration coating material comprises at least two of mullite, a rare earth silicate, a rare earth oxide, alumina, zirconia, hafnia, ZrSiO 4, HfSiO 4, TiO 2, Ta 2 O 5, carbon, boron oxide, borosilicate, alkali metal oxide, alkali earth metal oxide, silicon, silicon alloy, aluminum, boron, germanium, silica, barium strontium aluminosilicate, barium aluminosilicate, calcium aluminosilicate, magnesium aluminosilicate, or lithium aluminosilicate; drying the restoration slurry to form a dried restoration slurry; and heat treating the dried restoration slurry to cause reaction between the at least two of mullite, a rare earth silicate, a rare earth oxide, alumina, zirconia, hafnia, ZrSiO 4, HfSiO 4, TiO 2, Ta 2 O 5, carbon, boron oxide, borosilicate, alkali metal oxide, alkali earth metal oxide, silicon, silicon alloy, aluminum, boron, germanium, silica, barium strontium aluminosilicate, barium aluminosilicate, calcium aluminosilicate, magnesium aluminosilicate, or lithium aluminosilicate to form a restored portion of the abradable coating comprising a glass phase in the restored portion and to evaporate or burn off the fugitive material comprising graphite to form porosity in the restored portion of the abradable coating.