Brushing acid stain is different for all concrete surfaces. It's easier to hand brush a smooth hard-troweled floor than it is to brush a heavily broomed floor. Be aware and prepared for this ahead of time. It's also easier to see brush marks on smooth surfaces than it is to see them on rougher textures.
One option is to use an all-plastic pump sprayer to evenly distribute the acid stain on the surface. Another approach is to use a brush and make circular strokes for a more consistent and darker finish. For a more diffused look, you can simply apply the stain without brushing.
You can apply stain with a roller or brush if you are staining a relatively small surface or working in a tight space, but if you are staining a large surface, like a garage floor, it's recommended to use an acid-resistant airless paint sprayer.
Depending on the condition of the concrete, it may need some additional prep work before staining. If it's particularly rough or has high spots that need to be leveled out, you may need to grind or sand the surface. If a high-powered grinder isn't an option, then you can use sandpaper to get the job done.
The reason for washing the residue is to neutralize the acid. So long as you properly neutralize and rinse the concrete well a couple of times, it should be fine. Note: If you do not properly neutralize the stain, then the sealer will lose it's bond, which will then have to be stripped and re-applied.
Though new concrete may not always require a second coat of acid stain, older concrete does require two coats of stain for complete coverage. For a more diffuse look, spray the stain onto the surface without brushing.
Once that stain chemically reacts for a minimum of four to six hours—typically, you'll leave an acid stain overnight—it brings salts to the surface. All of these salts are like a powdery residue.
Allow the acid stain to penetrate the entire concrete surface and fully develop its color for from 5 to 24 hours (check manufacturer's instructions for exact timing). The longer you leave the acid stain on, the deeper the final hue will be.
If you don't get your cloth wet enough with stain, you'll have trouble getting the stain into recesses. You can always use a brush to help do this. There is one exception, however. Brushing can be more efficient for getting stain into inside corners and other recessed areas.
Rollers are a great way to apply wood stain as well for the speed at which you can apply the stain. However, when using rollers can be a disadvantage when you have hard to reach areas. If you are going to use a roller to apply your stain, make sure to have a brush as well for those hard to reach areas.
Add a pop of color to your courtyard with this acid-stained broom finish concrete transformation. Using the cola color, this project showcases how acid staining can create a vibrant and unique surface for your outdoor living space.
Drying time(final coat)- 4 hours minimum to overnight to 24 hours. Neutralizing and Cleaning the Residue from the Acid Stain will take one neutralizing and rinsing twice. Allow to completely dry for Clear Shield water base sealers. Allow to dry to be bone dry, for Solvent Base sealers.
No, the sticky stains will not dry after some time, which is why it is important to wipe off the excess wood stain. If you don't, your work will end up sticky because the stain did not dry properly. You will have to use mineral spirits, more stain, or sandpaper to fix the mess.
Step 9: Neutralize Acid Stain
Neutralize the stain using Ammonia and water once the stain has dried for at least 8 hours. I'd recommend using 2 cups of ammonia per 5 gallon bucket of water. Once neutralized, the acid will no longer react.
The problems that are most commonly noted with acid staining are related to application. If too much or not enough stain is applied, the results can be unattractive. This can be corrected by using the correct amount of stain. Using heavy coats of stain does not always help color develop better.
The curing of the concrete and the drying of the acid stain are critical. For newly installed concrete, a minimum of 14 days of cure time is required, preferably 21 before an acid stain is applied. Once cured, you can use an acid stain. After the stain is applied, allow it to dry for at least 24 hours.
Apply the Stain and Remove Residue
Use an acid-resistant airless paint sprayer to neatly and evenly apply the stain on the concrete slab. You may also use a paint roller or handheld brush for stain application in smaller areas and tight corners on the slab.
How deep does the acid stain react through the concrete surface? Concrete thickness can vary from ¼” to over 3′. However, depending on the finish (how it was troweled) and porosity of the concrete surface, the penetration of the acid reaction may be only 1/16″ – 3/16″.
So while you don't have to seal concrete, if you do, you will be enhancing and protecting the look of the concrete while extending it's lifespan considerably.
Fresh concrete is always much darker than when it is fully cured and dry. Even uncolored concrete. Wait at least 7 to 10 days until the new concrete has hardened and dried. If the concrete is on a wet subgrade or there's underground water, it may stay dark for as long as it's wet.
Staining concrete is a fast, simple way to turn your dull gray patio into a lively, colorful surface that will make your outdoor space more inviting. The stain is nearly foolproof to apply—just wet the concrete and spray on the stain.
Like any hard, smooth surface, stained concrete can become slippery when wet, especially if it has been coated with a high-gloss sealer. For concrete floors or walkways exposed to moisture or in areas with a lot of foot traffic, there are ways you can increase the slip resistance without affecting the color.
Unlike paint, stains don't chip or peel. Give your dull and worn-out concrete a lustrous look by applying a concrete stain that will both complement the look of your house and protect the integrity of the surface.