Crushed limestone base by the driveway contractor, so I don't know the exact designation, but I think it is 21A or one of those types (44?). There was about a yard leftover after the paver drive went in, so I had them put it where the patio is. I put it to about 4 inches depth. The concrete I used was simple readyMix you buy at the store....maybe Quickcrete is the same stuff. I was told not to use mortar because it will crack in the freeze/thaw cycle.
I just finished putting down polymeric on the driveway today. I paid about $64 for four bags at Unilock over the counter sales. If you use it be sure to read the directions on the bag. Barely mist the surface the first time you spray, wait 5 minutes, repeat the spray ever so slightly more the second time, wait another 5-10 minutes, now give it a little more, but don't create any flooding or puddling. The reason is the acrylic binder will become leached out of the sand and flow away with any drainage. However, it is easy to repair any spots later...it won't show at all. Also, I did 2000 ft2 over a 2 day period...just look to see where you left off if you don't do it all in one day. You could mark with chalk to keep track of what still needs to be done. Also, they tell you to remove the excess sand before misting, but you don't really have to get every single speck. Simply scrape the pavers with your shoe/boot later to rough up and remove any sand you missed earlier. you will be able to see it as a grainy material on top of the pavers. Good luck and let me know what you end up doing.
