Rust-Oleum Fast-Patch is a two-component epoxy putty that is designed to fill minor cracks, spalls, and low spots as well as vertical cracks and slab damage. It does not have to reach full cure to be profiled prior to coating. This makes it ideal for new installers filling hairline cracks, pits and small surface flaws. Fast Patch is the quickest, easiest way to make repairs without the use of any extra equipment. 2-Part epoxy - 1:1 mix ratio For best results prepare the surface by removing any dust, debris, paint, dirt, oil, loose concrete, including curing compounds or any other contaminants that may come in contact with the product. Make sure that the surface is dry before installation.