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Introducing Rust-Oleum Industrial Choice Inverted Marking Chalk - the perfect solution for temporary markings on concrete, pavement, asphalt, and other surfaces. This industrial-strength, water-based chalk provides vibrant blue lines that last up to 3 days. With its MC18 system, you can create crisp, straight lines and angles for traffic patterns, warehouse organization, sporting events, and more. Inverted Marking Chalk is easy to use and cleaner than traditional marking materials, making it a cost-effective solution for both small and large projects. Achieve professional results with Rust-Oleum Industrial Choice Inverted Marking Chalk - the smarter way to mark.