clipped

After trying several cleaners and paint removers if there is still some
paint left stuck in the pores, you will need to etch it out. Since the
stone sounds like it is outside and thick and probably not sealed anymore, a
diluted mixture of muriatic acid (or some kinds of toilet cleaner with HCL
in it). This will dissolve a thin layer of the rock surface leaving a fresh
new clean rock in its place and all the remaining paint will fall off.

Don't use too much acid and flush with lots of water when you are done. HCL
will generally neutralize itself quickly on the ground due to the abundance
of stuff to react with.


I would paint over it before I would use muriatic. A neighbor in our
condo stained some furniture outdoors in a covered atrium, concrete
deck, dark brown stain. The condo board was rumbling, so I got out my
craft paint - acryllics in little $2 bottle from craft store, many
colors. The trick was to vary the color, not apply thick coat, and
feather it so it blends. Used a stencil brush, two colors, a base and a
lighter, to imitate concrete coloring. It's been pressure washed since
and it still hides the brown stain )