grouting sandstone paver patio
Hoping for some input. I've installed about ~600sf of square cut, 1" thick, sandstone pavers around a pool... looks great. Now I'm grouting the installation. Have used a grout release product so it won't stick. Did a small section and am noticing white staining/streaks at the grout/stone intersection.
Does anyone know what this is? I think I heard somewhere where the lime from the original cement base can cause problems, is that what I'm seeing? Is there a way to get rid of it?