What is RP240 Penetrating Sealer? Oncrete RP240 is a solvent-based penetrating sealer which provides a durable, non-film forming, transparent protective barrier against oil and water on porous mineral surfaces. Oncrete RP240 helps to improve the stain resistance and makes it easy to clean up. Typically used to seal nature stone, unglazed tile, grout, terracotta, concrete, and brick. Features Provides a protective barrier that repels both water and oil. Permeability to water vapour and gases. Protection with no effect on appearance. Provides durable protection. Resistance to UV radiation. Makes cleaning easier. Technical Information