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Concrete staining is a popular method of enhancing the appearance of concrete surfaces. The most common reason for re-staining concrete is that the first layer is either in bad shape or they want a different look. In this article, I’ll talk about staining stained concrete and provide advice on how to proceed.
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Can You Stain Over Stained Concrete?
You can restain stained concrete. However, it’s essential to consider several factors before proceeding. For example, you can apply the new coat if the existing stain is in good condition. However, if the current coat of stain is damaged or worn, you must remove it before applying a new coat.
While staining is possible, there are some potential risks and limitations. Re-staining concrete that has already been stained may be a bad idea in some cases. For example, if the previous stain was very dark, achieving a lighter color without completely removing the previous stain may be difficult.
While adding concrete sealer after staining can protect it from weathering and other types of damage, re-staining previously stained concrete can shorten its lifespan. This is because the re-staining process involves removing some protective layers applied during the initial staining process, which can weaken the concrete over time.
Understanding Concrete Staining
Before I delve into the specifics of re-staining stained concrete, let’s first understand what concrete staining is and how it’s done. Concrete staining is applying a semi-transparent or opaque color to a concrete surface.
The stain penetrates the concrete and reacts with its minerals, creating a unique and permanent color that enhances the surface’s natural beauty.
There are two main types of concrete stains: acid- and water-based. Acid-based stains are made of hydrochloric acid and metallic salts. They are known for their ability to produce vibrant colors. On the other hand, water-based stains are made of acrylic and water-based polymers and are easier to apply and clean up.
Types Of Concrete Stain
Concrete stains are a popular way to give concrete surfaces color and texture. Concrete stains are classified into two types: acid-based stains and water-based stains.
Acid stains are composed of water, hydrochloric acid, and metallic salts. They chemically react with the concrete, creating a permanent, translucent color that will not chip, fade, or peel. Acid stains come in various earth-tone colors, including brown, terra-cotta, and tan.
Water-based stains are non-reactive stain that penetrates the surface of the concrete and imparts color by bonding to the pores of the concrete. They usually come in a wider variety of colors and can be used to create vibrant and intense colors. Water-based stains are also less harmful to the environment than acid-based stains.
Preparing Stained Concrete for Re-Staining
Before re-staining, ensure the concrete is clean and free of debris, stains, and sealers. You may need a concrete cleaner, pressure washer, or grinding machine to remove old sealers or coatings. Here are the steps to follow:
Step 1: Remove the Concrete Seal
To remove the concrete sealer, first, identify the type of sealer used. Following that, clean the concrete’s surface to remove any dirt or debris. Then, apply a sealer remover and soak it for the time recommended. Next, scrub the surface with a stiff-bristled brush or a floor buffer to remove the sealer.
Finally, clean water should be used to rinse the surface. Remember that the process may need to be repeated and that some sealers may require professional assistance to remove them safely.
Step 2: Clean the Surface
Use a concrete cleaner to remove dirt, debris, or oil stains. Rinse thoroughly and let the surface dry completely. A clean surface will ensure that the stain adheres to the concrete properly. Surface dirt, debris, or old coatings can prevent the stain from penetrating the concrete, resulting in an uneven or blotchy appearance.
Step 3: Test the Surface
Test a small concrete area with the new stain to ensure it’s compatible with the existing stain. Surface testing can help determine how the coating or finish will appear on the surface.
This is especially important for previously coated or finished surfaces because the new coating or finish may react differently with the old coating or finish. If the colors don’t blend well, you may need to adjust the color or try a different stain.
Step 4: Apply the New Stain
Apply the new stain according to the manufacturer’s instructions using a sprayer, roller, or brush. Make sure to apply it evenly and avoid overlapping. Here is an article about the best concrete stains I recommend.
Step 5: Let It Dry
Let the new stain dry completely before applying a sealer or wax. This can take anywhere from 24 to 48 hours, depending on the type of stain and the weather conditions.
Step 6: Apply a Seal
Sealing stained concrete is recommended to protect it from water damage, stains, and UV rays. Sealing also improves the surface’s shine and makes it easier to clean. Here is a video that talks about applying a water-based colored concrete sealer on precast concrete slabs:
Frequently Asked Questions
Do I Need to Seal My Stained Concrete
Sealing stained concrete is highly recommended to protect it from stains, moisture, and UV rays and improve its appearance and lifespan.
The stain only penetrates the top layer of the concrete surface when stained. However, this layer is still porous and susceptible to discoloration and staining from spills, water, and other contaminants. Therefore, seal the concrete after staining to create a barrier that prevents moisture and stains from penetrating the surface and causing damage.
How Much Does Staining Concrete Cost?
The cost of staining concrete varies depending on several factors, including the size of the area to be stained, the project’s complexity, the type of stain used, and the project’s location. Hiring someone or doing it yourself can also impact the project’s cost. Here is an in-depth article I wrote about the cost of concrete stains.
Conclusion
It is possible to stain over stained concrete, but it requires careful consideration and preparation to achieve the desired results. Before deciding to re-stain your concrete, consider the existing stain’s condition and the type of stain used. If it is in good condition, the previous stain can be re-stained with care.
However, if the existing stain is inconsistent, peeling, or flaking, it may be necessary to remove it first.
