Watch McCahill Painting remove rust stains from a pre-cast concrete building, a common problem that must be addressed prior to painting. We first remove the iron oxide chip, which is the cause of the stain. Next, we apply a rust-inhibitive primer and hydraulic cement to fill the hole. After a quick sand, a stain-killing prime coat is applied. The surface is restored and is now ready to paint, and our thorough process ensures the rust will not reappear.