Can shotcrete be painted like other concrete? Can an elastomeric paint, 100% acrylic latex house paint or solvent acrylic be used? I have a customer who wants to paint a tank which uses shotcrete. With normal concrete the surface must be 30 days or older, pH is approximately 7-8 and moisture content is low, remove efflorescence or laitance, etc., then it is ready to paint or coat. Do the same restrictions for shotcrete?

Shotcrete is pneumatically applied concrete. All surface prep work for concrete will be the same for shotcrete applications. Before a recommendation can be made, is this tank going to be painted on the outside or the inside? Second if this tank is to be painted on the inside, what will be put in it? The environment in which this tank is located also plays a key part in determining what type of paint or coating application. If this a tank that has been in operation, what was stored in it? Testing of the concrete in this case is important, in order to determine what method of surface prep would be needed to achieve a good coating bond.