PROSPEC BONSAL - is manufactured by Bonsal American, one of the largest producers of packaged building material products in the United States. A division of Oldcastle Architectural Products Group, Bonsal American has over 100 years of experience in concrete and flooring products. ProSpec is the professionally specified group of concrete repair and restoration, tile and stone installation, and flooring products and systems. ProSpec products are used throughout North America on a wide range of commercial and residential construction and concrete restoration projects.