Quote Originally Posted by Aurore
"swimming pool acid is the same thing. You can get it at any swimming pool supply place. They sell it by the gallon, and often in a two gallon pack."

You know, that's what I thought. I'm helping my mother get ready to sell her house, and the last owners turned the carport into a lanai... unfortunately, the carport cement had been painted green, so now the walkway and driveway are bare cement, but one strip of the walkway is partially green with old paint. I was pretty sure sulphuric acid was what we needed to etch the cement with... guess I can split the cost with her. Cool.

As far as battery acid, well, I think I'd rather buy the pool stuff. Must be psychological... same stuff, but somehow pool acid sounds safer than battery acid... :roll:
It may well be safer to rent a 5000 psi pressure sprayer and simply blast the paint away. Be careful though, I've seen one cut a hole in asphalt so don't point the sprayer at anything that don't need spraying. Especially at people. Going over all the concrete will make everything look more consistent.