The following photos are of a set of stairs that need some rehabilitation. Some of the edges have chipped away and there is spalling in areas. The contractor wanted a rapid setting material to return the stairs to service ASAP. The material selected for the repair was US SPEC R3. All loose concrete needs to be removed and any smooth surfaces will need to be properly abraded. Although R3 is a polymer modified product, the contractor would like to use a bonding agent as well. US SPEC Acyrlcoat is acceptable for use as a bonding agent with R3.