In my twenties I switched to using MekPak, a liquid solvent for polystyrene. You had to be careful, but no "strings" of glue, set faster, and was effectively "welding" the parts together. Applied with a fine paintbrush.
Telegraph marker posts ... nothing to do with IT Phasmid email discussion group ... also nothing to do with IT Beekeeping and honey site ... still nothing to do with IT