This post keeps on giving. I need some more help…
I have customer with a flagstone patio that was poorly installed. The flagstone is quite brittle, and the installer did not sweep off the polymeric sand before activating. The polymeric sand in the joints is also too soft and eroding.
The customer wants the polymeric sand removed from the stone, but I would say it’s more than haze at this pint. There are areas of hardened polymeric sand that are about a year old.
You mentioned NMD80. Do you think that would help here?
I read hot water would loosen the polymers. Not much luck. Tried F9 efflo, not much luck. High pressure chips up big flakes of flagstone or sand in the joints, so that’s no good. I’m out of ideas for removing the sand from the stone without removing it from the joints or damaging the stone.
