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YES!!!!!!! It has to be diluted with water or it will eat away at the surface. I know from personal experience.

This is very strong and corrosive. and should never be used full strength unless you are trained in using.

Muriatic acid is an impure form of hydrochloric acid. It is extremely corrosive and it is advised that you use a face shield, and use in a ventilated area only. The fumes are very corrosive and can cause irreparable lung damage. Improper use can release chlorine gas, a gas used in WW I by the Germans. If the purpose is to clean brick, or etch concrete it can be diluted, and should be. The recommended concentration to clean brick is at least 10 parts water to 1 part acid. If the acid releases a very strong fume on opening use 15 to 20 parts water.

It also reacts with various metals to form an explosive mixture with air.

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13y ago
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16y ago

Concrete sealer is designed to withstand chemical attacks. Muriatic acid, even at a 30% plus solution is considered a mild attack to sealers. The best way to remove sealer is a citrus degreaser. It is environmentally friendly and has a better fragrance. Solvents such as Xylene, Toluene, and MEK can be used also, but they can be very messy because the sealer will soften and then try to re-dry. Degreaser will actually dissolve the sealer.

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12y ago

no its not safe because evanthough it will get the concrete off it may burn through the car. it is also not safe for you because if it deflects or spils on you you could have a serious or Evan fatal injury

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11y ago

No. Muriatic acid will not remove paint from concrete. Muriatic acid will etch bare concrete though.

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Q: Is it safe to clean concrete off a car with muriatic acid?
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