If acid does not work then the only other means you have available are chemical top coats.
Muriatic acid to lighten concrete stain.
A smooth concrete floor must be roughened before paint will stick to it.
Muriatic acid can work wonders on filthy concrete and it can also be very useful in cleaning excess smears of dried mortar and grout or when attempting to alleviate tough rust stains.
Use a garden sprayer or paint brush to apply the solution to the stain.
It also reduces the surface alkalinity of the concrete that can cause some paints to adhere poorly.
After the concrete properly dries it s time to unveil the artwork and see what color the concrete has really become.
A solution of 40 parts water to 1 part muriatic acid a scrub brush and cotton rags will help remove the stain.
Despite its effectiveness muriatic acid should be used on concrete stains only if you ve tried gentler alternatives to no avail.
Concrete stain is the next logical option as you can stain the surface of the concrete.
Pour the acid into the water slowly.
You should see a chemical reaction as soon as you apply the muriatic acid.
Concrete stain is based on muriatic acid.
Mold rust and other stains can mar the clean beauty of your concrete lessening the visual impact and even the curb appeal of your property.
This acid reacts with the concrete opens up its surface and penetrates the concrete with its own metallic salts staining the concrete the chosen color.
How to neutralize and rinse concrete acid stain.
You roughen such a floor by etching it with muriatic acid.
The surface becomes etched and clean which allows for the proper adhesion of a new coating.
Keep in mind that acid stains are not soluble in water.
So if you want to scrub it down to try and lighten some areas do it when you first wash the residue.
To lighten stamped concrete after using a color release powder or liquid you must first strip the sealant with a chemical stripper designed for this.
You can use a mild acid to remove some of the color.
Apply the solution to the surface.
How to neutralize concrete acid stain.
Always add the acid to the water to help prevent acid splashing out of the mixing container.
Muriatic acid acts like liquid sandpaper by roughening the surface of the concrete.
This means that water alone will not do much in regard to removing the orange colored stain.
Today concrete can be both stained and dyed to achieve a variety of colors and textures.
