The most repair Products today are polymer-modified concrete, meaning that the basic material is a Portland cement and aggregate mixture with a polymer added. A couple of important factors in selecting a repair material are polymer based. This product provides a very hard durable-appearing patch for 1-2 holes and blows. I wire brushed, scraped and vacuumed areas first. It will sand but it takes a lot of exertion if doing it by hand. The epoxy completely set up overnight. The only negative is that it becomes quite tacky after mixing and doesn’t flow or self-level easily in holes. That could have been the result of my mixing proportions. Definitely recommended.