In March of 2012 my company received a call from an outfit that was working on a project at San Joaquin Delta College in Stockton, California. They wanted to discuss the issues that they were having with the application of an acid stain on almost 50,000 square feet of floor.
The stain would go on three floors of a a new science and math complex to replace the Cunningham Building. One challenge was that on the bottom floor they had one kind of concrete, while on the second and third floor they had a specialty lightweight concrete.
Unfortunately the mix design specs were not really clear. They had also applied a water-based curing compound very inconsistently, in some areas very heavily. So this was a challenging project.