You roughen such a floor by etching it with muriatic acid.
Muriatic acid cleaning concrete floors.
Muriatic acid acts like liquid sandpaper by roughening the surface of the concrete.
If you re just removing mineral deposits efflorescence use a much weaker mix 10 1 or 16 1 for muriatic acid.
With proper use it removes stains when other cleaners fail.
Acid etching is the process of applying hydrochloric muriatic or buffered phosphoric acid to a slab then rinsing it off with water.
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.
If you are planning to acid wash near asphalt drywall or tarmac then it is important to create a barrier.
Muriatic acid is a strong acid cleaner used on masonry surfaces to clean stains.
It also reduces the surface alkalinity of the concrete that can cause some paints to adhere poorly.
Let the detergent sit for 45 minutes then pour boiling water on the area and vigorously scrub the stained section with the broom.
The most common acids used to clean concrete and bricks are hydrochloric acid muriatic or phosphoric acid.
Step 2 create a barrier.
It is excellent for cleaning away rust stains and efflorescence but must be used with extreme caution.
Muriatic acid should never be used indoors and has to be thoroughly neutralized before disposal.
For stubborn stains use muriatic acid in combination with your pressure washer set to at least 1200 psi.
Muriatic acid is the strongest acid available to the public.
If the acid comes in contact with skin wash it away with large amounts of water.
For many years it was a standard method of concrete preparation used by nearly all industrial commercial and institutional floor coating installers depending on the floor size and system to be installed.
A smooth concrete floor must be roughened before paint will stick to it.
Even if you rinse the floor with water the cleaning products you use may leave residues that will react with the acid in dangerous ways.
Pour dry dishwasher detergent or a concrete cleaning agent on the stain.
Mix 3 to 4 parts water with 1 part acid or follow label instructions for a 10 concentration 15 for hard smooth concrete.
