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A deep-penetrating primer soaks into render, filler or brick, strengthens the surface and evens out absorption, so paint goes on more evenly and less is used. PROFI GRUNT is ready to use and is not diluted. GRUNT CONCENTRATE 1:4 is diluted with water: 2 L of concentrate makes 10 L of primer. The 1:10 concentrate makes up to 55 L of primer from a 5 L can for large jobs.