Bricks, Masonry, Asphalt and Concrete - Fixing Muriatic Acid Stains

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View Full Version : Fixing Muriatic Acid Stains

joudin
07-22-06, 12:31 PM
Used a diluted muriatic acid + water solution to clean rust stains on driveway but it darkened (browned/yellowed) the area I treated. What can I do to 'bring the regular grey color back" ?

Tscarborough
07-22-06, 12:34 PM
You can't, and muriatic will not remove rust stains.
joudin
07-22-06, 12:36 PM
but the rust is gone... (I guess with the "cream" from the concrete surface as well)

Tscarborough
07-22-06, 12:37 PM
Right, you removed the cement, not the rust. The only thing you can do is skim coat it with a repair mortar, but it will be very dark gray and probably fail anyway.
joudin
07-22-06, 12:42 PM
thanks. one last thought...anyway to bleach the entire area? The driveway is only 4 months old so still grey.
Tscarborough
07-22-06, 12:51 PM
You could acid stain the whole thing about the same color as the area the you burned.