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Rust-Oleum Porous Concrete Floor Primer seals previously ground, severely worn, old and absorbent concrete, allowing for better top coat coverage. To test whether you need to prime your concrete surface, drip a small amount of water onto the concrete. If absorbed quickly, Porous Concrete Primer is required. Use of Porous Concrete Primer will ensure maximum coverage of Rust-Oleum top coat floor coatings.