N S P61B is a ready-to-use, low-viscosity, colourless impregnation agent which penetrates into micropores by capillary action. The agent is hydrophobic, seals reliably due to its permanently elastic properties and contains solvents. The sealer can be used for thermal spray coatings. S P61B has very good resistance to aqueous chemicals and showed excellent results in the salt spray test (on par with two-component sealers).