I use a waterglass seal in MagTech brass with, basically, no problems. I use wads greased with a mixture of toilet bowl wax and olive oil, so they're pretty goopy. My routine has evolved to a lacquer thinner wipe before pouring shot and sealing - no worries. The pre-evolution mode was to just ram the wad, pour the powder, place the wad and seal it. They held enough to get the job done, but with handling some of them would try to walk out a bit.