Methods of improving surface roughness of an environmental barrier coating

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A method for improving surface roughness of an environmental barrier coating comprising : providing a component (10) having a plasma sprayed environmental barrier coating; applying an outer layer repair slurry to the environmental barrier coating of the component; drying the environmental barrier coating having the applied outer layer repair slurry; and sintering the component to produce a component having an improved surface roughness wherein the outer layer repair slurry comprises : water; a primary outer material comprising BSAS; and a slurry sintering aid selected from the group consisting of rare earth nitrate, rare earth acetate, rare earth chloride, rare earth oxide, ammonium phosphate, phosphoric acid, polyvinyl phosphonic acid, and combinations thereof.