DaveNJ, I did use the adhesive putting the caps in place. That's some good stuff! It just might be better than mortar! :lol:
summersgal, I wouldn't think there would be an issue with ponds and rain and such. They're heavy enough that they're not going anywhere. In fact, on the first course, just to be on the safe side I pounded a rebar pin in the middle hole and then put mortar in that hole! Might be overkill, but I'm willing to bet a hurricane could come through here and that wall will still be there!! :lol: