Applying an acid stain like Sedona Acid Stain to concrete can be a great way to liven up indoor and outdoor spaces. Even so, in order to achieve the best possible results, you will want to make certain that you have the right canvas from which to work. This typically means cleaning the concrete slab prior to applying the acid stain.
Proper cleaning of an older concrete slab will make it much easier for the stain to absorb and adhere ensuring longer lasting results. One of the most important things to keep in mind when cleaning a concrete slab is to avoid using any type of harsh etching solution or acid wash. This includes muriatic acid. If you apply any type of acid to the slab when cleaning it, the acid stain will likely not take. If you are looking for the perfect cleaner than look to Surf Prep – The ideal surface preparation and cleaner product.
Acceptable Cleaners for Cleaning a Concrete Slab
Instead, it is much better to use a solution of trisodium phosphate, or TSP. This should be applied using a scrub brush. You may find that using a long-handled scrub brush makes it easier to clean your concrete slab. If you find this to be too much work, you might find it easier to use a pressure washer. While grease stains can be difficult to clean from concrete, if you do have such stubborn stains, mineral spirits or lacquer thinner may help.
Keep in mind that even with a significant amount of scrubbing, there may still be patches left on your concrete slab that will not accept an acid stain. This is usually due to a lack of lime content within the concrete. This is important, as the lime is necessary for the chemical reaction to occur with the acid stain. When this is the case, it may be necessary to apply a faux finish that will match the surrounding acid stain using a concrete dye or solvent based stain.