Roadware 10-Minute Concrete Mender is now available with new needle tip mixers, from 0.8 to 1.6 mm. They are perfect for repairing hairline cracks. Use it on polished floors, decorative concrete, or anyplace where aggressive cutting and preparation is not desired. The repair will not get brittle over time and can be coated or polished within minutes. Roadware Inc. 800-522-7623.