This is what I was leaning towards. Don't tell Papa NickJoe, put some A535 on those tight joints to loosen them up lol !!!
Kill the weeds with non-selective weed killer (roundup or wipeout) and only use silica sand for joints tighter than 1/4 inch. Polymeric is only good for joints 1/4 inch and larger.
sent from my Purple LGG4 on the GTAM app