Skeptical about pre-mixed mortar, now I'm a convert.
I always mixed my own mortar on site, thought the bagged stuff was for rookies. Then a big commercial job came up, 500 blocks for a retaining wall in Austin, and the boss insisted on using pre-mixed Type S. I figured it'd be weak or dry out too fast, but that stuff stayed workable for like 25 minutes longer than my usual mix. Has anyone else had a bad experience with pre-mixed, or am I just late to the party?